




〖One〗,76年前的巨震:唐山地震对中国抗震救灾的深远影响揭秘
,The Impactful Earthquake of Dali in 1925: A Historical Turning Point
In the early 20th century, Dali, located in Yunnan Province of China, experienced a seismic event that would leave an indelible mark on the region’s history. The 1925 Dali earthquake was not only a powerful natural disaster but also a catalyst for transformation in the social, economic, and cultural fabric of Dali. This article provides a detailed and comprehensive examination of the 1925 earthquake, its causes, effects, and the lasting legacy it imprinted on Dali and beyond.
Understanding the Geographical and Geological Context of Dali
Before delving into the specifics of the 1925 earthquake, it is important to understand the geographical and geological background of Dali. Situated in a seismically active region along the eastern edge of the Tibetan Plateau, Dali lies near several fault lines, including the Red River Fault. These tectonic settings make the area prone to frequent seismic activities. The interplay between the Indian Plate and the Eurasian Plate contributes significantly to the regional seismicity. This context set the stage for the inevitable natural event that struck in 1925.
The 1925 Dali Earthquake: Details of the Event
The Dali earthquake occurred on March 16, 1925, with a magnitude estimated at 7.0 on the Richter scale. It struck at a shallow depth, intensifying the shaking experienced by residents across the region. The epicenter was close to Dali City, resulting in severe devastation. Reports indicate that many buildings, including traditional wooden houses and historical structures, were destroyed or severely damaged. This earthquake caused widespread fear and confusion, as early 20th-century China had limited disaster response mechanisms.
Human and Economic Losses
The human toll from the Dali earthquake was devastating. Thousands of lives were lost, and many more were injured. The destruction of homes led to a high number of displaced individuals who faced harsh living conditions in the aftermath. Economically, Dali suffered significant setbacks. Agriculture, a primary livelihood in the region, was heavily disrupted due to damaged irrigation systems and farmland. Additionally, trade and commerce slowed dramatically as infrastructure including roads and bridges collapsed, isolating the community during critical recovery periods.
The Cultural and Social Impact on Dali
Beyond the physical and economic damage, the earthquake had profound cultural and social ramifications. Many historical landmarks and ancient temples that reflected Dali’s rich heritage were ruined. The loss of cultural heritage sites was deeply felt by the local population and scholars alike. Moreover, the disaster united the community, fostering a spirit of resilience and cooperation. The collective experience also heightened awareness about disaster preparedness and encouraged shifts in construction practices to better withstand future quakes.
Recovery and Reconstruction Efforts
Recovery from the 1925 earthquake was a long and challenging process. Initial relief efforts were hampered by limited resources and logistical difficulties. However, over time, both local authorities and external organizations mobilized aid and support. Reconstruction focused not only on rebuilding homes and infrastructure but also on improving seismic safety standards. These efforts marked one of the early examples of disaster management in China and laid a foundation for more systematic responses to natural disasters in subsequent decades.
Legacy and Lessons for Modern Seismology
The 1925 Dali earthquake remains a significant geological and historical reference point. It contributed valuable data to the study of seismic activity in southwestern China and helped improve the scientific understanding of fault mechanics in the region. Lessons learned from the disaster also informed modern urban planning and disaster mitigation strategies in seismic zones. Today, the memory of the earthquake is preserved through museums and memorials, serving as a reminder of nature’s power and the resilience of human communities.
In conclusion, the Dali earthquake of 1925 was a pivotal event that shaped the trajectory of the region’s development. By examining the geographical causes, the catastrophic event itself, resulting losses, and the community’s extraordinary recovery efforts, we gain a fuller appreciation of this historical earthquake’s comprehensive impact. It stands as a testament to both the destructive potential of Earth’s shifting plates and the enduring strength of those who survive and rebuild.
The Impactful Earthquake of Dali in 1925: A Historical Turning Point
In the early 20th century, Dali, located in Yunnan Province of China, experienced a seismic event that would leave an indelible mark on the region’s history. The 1925 Dali earthquake was not only a powerful natural disaster but also a catalyst for transformation in the social, economic, and cultural fabric of Dali. This article provides a detailed and comprehensive examination of the 1925 earthquake, its causes, effects, and the lasting legacy it imprinted on Dali and beyond.
Understanding the Geographical and Geological Context of Dali
Before delving into the specifics of the 1925 earthquake, it is important to understand the geographical and geological background of Dali. Situated in a seismically active region along the eastern edge of the Tibetan Plateau, Dali lies near several fault lines, including the Red River Fault. These tectonic settings make the area prone to frequent seismic activities. The interplay between the Indian Plate and the Eurasian Plate contributes significantly to the regional seismicity. This context set the stage for the inevitable natural event that struck in 1925.
The 1925 Dali Earthquake: Details of the Event
The Dali earthquake occurred on March 16, 1925, with a magnitude estimated at 7.0 on the Richter scale. It struck at a shallow depth, intensifying the shaking experienced by residents across the region. The epicenter was close to Dali City, resulting in severe devastation. Reports indicate that many buildings, including traditional wooden houses and historical structures, were destroyed or severely damaged. This earthquake caused widespread fear and confusion, as early 20th-century China had limited disaster response mechanisms.
Human and Economic Losses
The human toll from the Dali earthquake was devastating. Thousands of lives were lost, and many more were injured. The destruction of homes led to a high number of displaced individuals who faced harsh living conditions in the aftermath. Economically, Dali suffered significant setbacks. Agriculture, a primary livelihood in the region, was heavily disrupted due to damaged irrigation systems and farmland. Additionally, trade and commerce slowed dramatically as infrastructure including roads and bridges collapsed, isolating the community during critical recovery periods.
The Cultural and Social Impact on Dali
Beyond the physical and economic damage, the earthquake had profound cultural and social ramifications. Many historical landmarks and ancient temples that reflected Dali’s rich heritage were ruined. The loss of cultural heritage sites was deeply felt by the local population and scholars alike. Moreover, the disaster united the community, fostering a spirit of resilience and cooperation. The collective experience also heightened awareness about disaster preparedness and encouraged shifts in construction practices to better withstand future quakes.
Recovery and Reconstruction Efforts
Recovery from the 1925 earthquake was a long and challenging process. Initial relief efforts were hampered by limited resources and logistical difficulties. However, over time, both local authorities and external organizations mobilized aid and support. Reconstruction focused not only on rebuilding homes and infrastructure but also on improving seismic safety standards. These efforts marked one of the early examples of disaster management in China and laid a foundation for more systematic responses to natural disasters in subsequent decades.
Legacy and Lessons for Modern Seismology
The 1925 Dali earthquake remains a significant geological and historical reference point. It contributed valuable data to the study of seismic activity in southwestern China and helped improve the scientific understanding of fault mechanics in the region. Lessons learned from the disaster also informed modern urban planning and disaster mitigation strategies in seismic zones. Today, the memory of the earthquake is preserved through museums and memorials, serving as a reminder of nature’s power and the resilience of human communities.
In conclusion, the Dali earthquake of 1925 was a pivotal event that shaped the trajectory of the region’s development. By examining the geographical causes, the catastrophic event itself, resulting losses, and the community’s extraordinary recovery efforts, we gain a fuller appreciation of this historical earthquake’s comprehensive impact. It stands as a testament to both the destructive potential of Earth’s shifting plates and the enduring strength of those who survive and rebuild.
The Impactful Earthquake of Dali in 1925: A Historical Turning Point
In the early 20th century, Dali, located in Yunnan Province of China, experienced a seismic event that would leave an indelible mark on the region’s history. The 1925 Dali earthquake was not only a powerful natural disaster but also a catalyst for transformation in the social, economic, and cultural fabric of Dali. This article provides a detailed and comprehensive examination of the 1925 earthquake, its causes, effects, and the lasting legacy it imprinted on Dali and beyond.
Understanding the Geographical and Geological Context of Dali
Before delving into the specifics of the 1925 earthquake, it is important to understand the geographical and geological background of Dali. Situated in a seismically active region along the eastern edge of the Tibetan Plateau, Dali lies near several fault lines, including the Red River Fault. These tectonic settings make the area prone to frequent seismic activities. The interplay between the Indian Plate and the Eurasian Plate contributes significantly to the regional seismicity. This context set the stage for the inevitable natural event that struck in 1925.
The 1925 Dali Earthquake: Details of the Event
The Dali earthquake occurred on March 16, 1925, with a magnitude estimated at 7.0 on the Richter scale. It struck at a shallow depth, intensifying the shaking experienced by residents across the region. The epicenter was close to Dali City, resulting in severe devastation. Reports indicate that many buildings, including traditional wooden houses and historical structures, were destroyed or severely damaged. This earthquake caused widespread fear and confusion, as early 20th-century China had limited disaster response mechanisms.
Human and Economic Losses
The human toll from the Dali earthquake was devastating. Thousands of lives were lost, and many more were injured. The destruction of homes led to a high number of displaced individuals who faced harsh living conditions in the aftermath. Economically, Dali suffered significant setbacks. Agriculture, a primary livelihood in the region, was heavily disrupted due to damaged irrigation systems and farmland. Additionally, trade and commerce slowed dramatically as infrastructure including roads and bridges collapsed, isolating the community during critical recovery periods.
The Cultural and Social Impact on Dali
Beyond the physical and economic damage, the earthquake had profound cultural and social ramifications. Many historical landmarks and ancient temples that reflected Dali’s rich heritage were ruined. The loss of cultural heritage sites was deeply felt by the local population and scholars alike. Moreover, the disaster united the community, fostering a spirit of resilience and cooperation. The collective experience also heightened awareness about disaster preparedness and encouraged shifts in construction practices to better withstand future quakes.
Recovery and Reconstruction Efforts
Recovery from the 1925 earthquake was a long and challenging process. Initial relief efforts were hampered by limited resources and logistical difficulties. However, over time, both local authorities and external organizations mobilized aid and support. Reconstruction focused not only on rebuilding homes and infrastructure but also on improving seismic safety standards. These efforts marked one of the early examples of disaster management in China and laid a foundation for more systematic responses to natural disasters in subsequent decades.
Legacy and Lessons for Modern Seismology
The 1925 Dali earthquake remains a significant geological and historical reference point. It contributed valuable data to the study of seismic activity in southwestern China and helped improve the scientific understanding of fault mechanics in the region. Lessons learned from the disaster also informed modern urban planning and disaster mitigation strategies in seismic zones. Today, the memory of the earthquake is preserved through museums and memorials, serving as a reminder of nature’s power and the resilience of human communities.
In conclusion, the Dali earthquake of 1925 was a pivotal event that shaped the trajectory of the region’s development. By examining the geographical causes, the catastrophic event itself, resulting losses, and the community’s extraordinary recovery efforts, we gain a fuller appreciation of this historical earthquake’s comprehensive impact. It stands as a testament to both the destructive potential of Earth’s shifting plates and the enduring strength of those who survive and rebuild.
The Impactful Earthquake of Dali in 1925: A Historical Turning Point
In the early 20th century, Dali, located in Yunnan Province of China, experienced a seismic event that would leave an indelible mark on the region’s history. The 1925 Dali earthquake was not only a powerful natural disaster but also a catalyst for transformation in the social, economic, and cultural fabric of Dali. This article provides a detailed and comprehensive examination of the 1925 earthquake, its causes, effects, and the lasting legacy it imprinted on Dali and beyond.
Understanding the Geographical and Geological Context of Dali
Before delving into the specifics of the 1925 earthquake, it is important to understand the geographical and geological background of Dali. Situated in a seismically active region along the eastern edge of the Tibetan Plateau, Dali lies near several fault lines, including the Red River Fault. These tectonic settings make the area prone to frequent seismic activities. The interplay between the Indian Plate and the Eurasian Plate contributes significantly to the regional seismicity. This context set the stage for the inevitable natural event that struck in 1925.
The 1925 Dali Earthquake: Details of the Event
The Dali earthquake occurred on March 16, 1925, with a magnitude estimated at 7.0 on the Richter scale. It struck at a shallow depth, intensifying the shaking experienced by residents across the region. The epicenter was close to Dali City, resulting in severe devastation. Reports indicate that many buildings, including traditional wooden houses and historical structures, were destroyed or severely damaged. This earthquake caused widespread fear and confusion, as early 20th-century China had limited disaster response mechanisms.
Human and Economic Losses
The human toll from the Dali earthquake was devastating. Thousands of lives were lost, and many more were injured. The destruction of homes led to a high number of displaced individuals who faced harsh living conditions in the aftermath. Economically, Dali suffered significant setbacks. Agriculture, a primary livelihood in the region, was heavily disrupted due to damaged irrigation systems and farmland. Additionally, trade and commerce slowed dramatically as infrastructure including roads and bridges collapsed, isolating the community during critical recovery periods.
The Cultural and Social Impact on Dali
Beyond the physical and economic damage, the earthquake had profound cultural and social ramifications. Many historical landmarks and ancient temples that reflected Dali’s rich heritage were ruined. The loss of cultural heritage sites was deeply felt by the local population and scholars alike. Moreover, the disaster united the community, fostering a spirit of resilience and cooperation. The collective experience also heightened awareness about disaster preparedness and encouraged shifts in construction practices to better withstand future quakes.
Recovery and Reconstruction Efforts
Recovery from the 1925 earthquake was a long and challenging process. Initial relief efforts were hampered by limited resources and logistical difficulties. However, over time, both local authorities and external organizations mobilized aid and support. Reconstruction focused not only on rebuilding homes and infrastructure but also on improving seismic safety standards. These efforts marked one of the early examples of disaster management in China and laid a foundation for more systematic responses to natural disasters in subsequent decades.
Legacy and Lessons for Modern Seismology
The 1925 Dali earthquake remains a significant geological and historical reference point. It contributed valuable data to the study of seismic activity in southwestern China and helped improve the scientific understanding of fault mechanics in the region. Lessons learned from the disaster also informed modern urban planning and disaster mitigation strategies in seismic zones. Today, the memory of the earthquake is preserved through museums and memorials, serving as a reminder of nature’s power and the resilience of human communities.
In conclusion, the Dali earthquake of 1925 was a pivotal event that shaped the trajectory of the region’s development. By examining the geographical causes, the catastrophic event itself, resulting losses, and the community’s extraordinary recovery efforts, we gain a fuller appreciation of this historical earthquake’s comprehensive impact. It stands as a testament to both the destructive potential of Earth’s shifting plates and the enduring strength of those who survive and rebuild.
The Impactful Earthquake of Dali in 1925: A Historical Turning Point
In the early 20th century, Dali, located in Yunnan Province of China, experienced a seismic event that would leave an indelible mark on the region’s history. The 1925 Dali earthquake was not only a powerful natural disaster but also a catalyst for transformation in the social, economic, and cultural fabric of Dali. This article provides a detailed and comprehensive examination of the 1925 earthquake, its causes, effects, and the lasting legacy it imprinted on Dali and beyond.
Understanding the Geographical and Geological Context of Dali
Before delving into the specifics of the 1925 earthquake, it is important to understand the geographical and geological background of Dali. Situated in a seismically active region along the eastern edge of the Tibetan Plateau, Dali lies near several fault lines, including the Red River Fault. These tectonic settings make the area prone to frequent seismic activities. The interplay between the Indian Plate and the Eurasian Plate contributes significantly to the regional seismicity. This context set the stage for the inevitable natural event that struck in 1925.
The 1925 Dali Earthquake: Details of the Event
The Dali earthquake occurred on March 16, 1925, with a magnitude estimated at 7.0 on the Richter scale. It struck at a shallow depth, intensifying the shaking experienced by residents across the region. The epicenter was close to Dali City, resulting in severe devastation. Reports indicate that many buildings, including traditional wooden houses and historical structures, were destroyed or severely damaged. This earthquake caused widespread fear and confusion, as early 20th-century China had limited disaster response mechanisms.
Human and Economic Losses
The human toll from the Dali earthquake was devastating. Thousands of lives were lost, and many more were injured. The destruction of homes led to a high number of displaced individuals who faced harsh living conditions in the aftermath. Economically, Dali suffered significant setbacks. Agriculture, a primary livelihood in the region, was heavily disrupted due to damaged irrigation systems and farmland. Additionally, trade and commerce slowed dramatically as infrastructure including roads and bridges collapsed, isolating the community during critical recovery periods.
The Cultural and Social Impact on Dali
Beyond the physical and economic damage, the earthquake had profound cultural and social ramifications. Many historical landmarks and ancient temples that reflected Dali’s rich heritage were ruined. The loss of cultural heritage sites was deeply felt by the local population and scholars alike. Moreover, the disaster united the community, fostering a spirit of resilience and cooperation. The collective experience also heightened awareness about disaster preparedness and encouraged shifts in construction practices to better withstand future quakes.
Recovery and Reconstruction Efforts
Recovery from the 1925 earthquake was a long and challenging process. Initial relief efforts were hampered by limited resources and logistical difficulties. However, over time, both local authorities and external organizations mobilized aid and support. Reconstruction focused not only on rebuilding homes and infrastructure but also on improving seismic safety standards. These efforts marked one of the early examples of disaster management in China and laid a foundation for more systematic responses to natural disasters in subsequent decades.
Legacy and Lessons for Modern Seismology
The 1925 Dali earthquake remains a significant geological and historical reference point. It contributed valuable data to the study of seismic activity in southwestern China and helped improve the scientific understanding of fault mechanics in the region. Lessons learned from the disaster also informed modern urban planning and disaster mitigation strategies in seismic zones. Today, the memory of the earthquake is preserved through museums and memorials, serving as a reminder of nature’s power and the resilience of human communities.
In conclusion, the Dali earthquake of 1925 was a pivotal event that shaped the trajectory of the region’s development. By examining the geographical causes, the catastrophic event itself, resulting losses, and the community’s extraordinary recovery efforts, we gain a fuller appreciation of this historical earthquake’s comprehensive impact. It stands as a testament to both the destructive potential of Earth’s shifting plates and the enduring strength of those who survive and rebuild.
The Impactful Earthquake of Dali in 1925: A Historical Turning Point
In the early 20th century, Dali, located in Yunnan Province of China, experienced a seismic event that would leave an indelible mark on the region’s history. The 1925 Dali earthquake was not only a powerful natural disaster but also a catalyst for transformation in the social, economic, and cultural fabric of Dali. This article provides a detailed and comprehensive examination of the 1925 earthquake, its causes, effects, and the lasting legacy it imprinted on Dali and beyond.
Understanding the Geographical and Geological Context of Dali
Before delving into the specifics of the 1925 earthquake, it is important to understand the geographical and geological background of Dali. Situated in a seismically active region along the eastern edge of the Tibetan Plateau, Dali lies near several fault lines, including the Red River Fault. These tectonic settings make the area prone to frequent seismic activities. The interplay between the Indian Plate and the Eurasian Plate contributes significantly to the regional seismicity. This context set the stage for the inevitable natural event that struck in 1925.
The 1925 Dali Earthquake: Details of the Event
The Dali earthquake occurred on March 16, 1925, with a magnitude estimated at 7.0 on the Richter scale. It struck at a shallow depth, intensifying the shaking experienced by residents across the region. The epicenter was close to Dali City, resulting in severe devastation. Reports indicate that many buildings, including traditional wooden houses and historical structures, were destroyed or severely damaged. This earthquake caused widespread fear and confusion, as early 20th-century China had limited disaster response mechanisms.
Human and Economic Losses
The human toll from the Dali earthquake was devastating. Thousands of lives were lost, and many more were injured. The destruction of homes led to a high number of displaced individuals who faced harsh living conditions in the aftermath. Economically, Dali suffered significant setbacks. Agriculture, a primary livelihood in the region, was heavily disrupted due to damaged irrigation systems and farmland. Additionally, trade and commerce slowed dramatically as infrastructure including roads and bridges collapsed, isolating the community during critical recovery periods.
The Cultural and Social Impact on Dali
Beyond the physical and economic damage, the earthquake had profound cultural and social ramifications. Many historical landmarks and ancient temples that reflected Dali’s rich heritage were ruined. The loss of cultural heritage sites was deeply felt by the local population and scholars alike. Moreover, the disaster united the community, fostering a spirit of resilience and cooperation. The collective experience also heightened awareness about disaster preparedness and encouraged shifts in construction practices to better withstand future quakes.
Recovery and Reconstruction Efforts
Recovery from the 1925 earthquake was a long and challenging process. Initial relief efforts were hampered by limited resources and logistical difficulties. However, over time, both local authorities and external organizations mobilized aid and support. Reconstruction focused not only on rebuilding homes and infrastructure but also on improving seismic safety standards. These efforts marked one of the early examples of disaster management in China and laid a foundation for more systematic responses to natural disasters in subsequent decades.
Legacy and Lessons for Modern Seismology
The 1925 Dali earthquake remains a significant geological and historical reference point. It contributed valuable data to the study of seismic activity in southwestern China and helped improve the scientific understanding of fault mechanics in the region. Lessons learned from the disaster also informed modern urban planning and disaster mitigation strategies in seismic zones. Today, the memory of the earthquake is preserved through museums and memorials, serving as a reminder of nature’s power and the resilience of human communities.
In conclusion, the Dali earthquake of 1925 was a pivotal event that shaped the trajectory of the region’s development. By examining the geographical causes, the catastrophic event itself, resulting losses, and the community’s extraordinary recovery efforts, we gain a fuller appreciation of this historical earthquake’s comprehensive impact. It stands as a testament to both the destructive potential of Earth’s shifting plates and the enduring strength of those who survive and rebuild.
The Impactful Earthquake of Dali in 1925: A Historical Turning Point
In the early 20th century, Dali, located in Yunnan Province of China, experienced a seismic event that would leave an indelible mark on the region’s history. The 1925 Dali earthquake was not only a powerful natural disaster but also a catalyst for transformation in the social, economic, and cultural fabric of Dali. This article provides a detailed and comprehensive examination of the 1925 earthquake, its causes, effects, and the lasting legacy it imprinted on Dali and beyond.
Understanding the Geographical and Geological Context of Dali
Before delving into the specifics of the 1925 earthquake, it is important to understand the geographical and geological background of Dali. Situated in a seismically active region along the eastern edge of the Tibetan Plateau, Dali lies near several fault lines, including the Red River Fault. These tectonic settings make the area prone to frequent seismic activities. The interplay between the Indian Plate and the Eurasian Plate contributes significantly to the regional seismicity. This context set the stage for the inevitable natural event that struck in 1925.
The 1925 Dali Earthquake: Details of the Event
The Dali earthquake occurred on March 16, 1925, with a magnitude estimated at 7.0 on the Richter scale. It struck at a shallow depth, intensifying the shaking experienced by residents across the region. The epicenter was close to Dali City, resulting in severe devastation. Reports indicate that many buildings, including traditional wooden houses and historical structures, were destroyed or severely damaged. This earthquake caused widespread fear and confusion, as early 20th-century China had limited disaster response mechanisms.
Human and Economic Losses
The human toll from the Dali earthquake was devastating. Thousands of lives were lost, and many more were injured. The destruction of homes led to a high number of displaced individuals who faced harsh living conditions in the aftermath. Economically, Dali suffered significant setbacks. Agriculture, a primary livelihood in the region, was heavily disrupted due to damaged irrigation systems and farmland. Additionally, trade and commerce slowed dramatically as infrastructure including roads and bridges collapsed, isolating the community during critical recovery periods.
The Cultural and Social Impact on Dali
Beyond the physical and economic damage, the earthquake had profound cultural and social ramifications. Many historical landmarks and ancient temples that reflected Dali’s rich heritage were ruined. The loss of cultural heritage sites was deeply felt by the local population and scholars alike. Moreover, the disaster united the community, fostering a spirit of resilience and cooperation. The collective experience also heightened awareness about disaster preparedness and encouraged shifts in construction practices to better withstand future quakes.
Recovery and Reconstruction Efforts
Recovery from the 1925 earthquake was a long and challenging process. Initial relief efforts were hampered by limited resources and logistical difficulties. However, over time, both local authorities and external organizations mobilized aid and support. Reconstruction focused not only on rebuilding homes and infrastructure but also on improving seismic safety standards. These efforts marked one of the early examples of disaster management in China and laid a foundation for more systematic responses to natural disasters in subsequent decades.
Legacy and Lessons for Modern Seismology
The 1925 Dali earthquake remains a significant geological and historical reference point. It contributed valuable data to the study of seismic activity in southwestern China and helped improve the scientific understanding of fault mechanics in the region. Lessons learned from the disaster also informed modern urban planning and disaster mitigation strategies in seismic zones. Today, the memory of the earthquake is preserved through museums and memorials, serving as a reminder of nature’s power and the resilience of human communities.
In conclusion, the Dali earthquake of 1925 was a pivotal event that shaped the trajectory of the region’s development. By examining the geographical causes, the catastrophic event itself, resulting losses, and the community’s extraordinary recovery efforts, we gain a fuller appreciation of this historical earthquake’s comprehensive impact. It stands as a testament to both the destructive potential of Earth’s shifting plates and the enduring strength of those who survive and rebuild.