Video data files to accompany USGS OFR 2015-1142--Assessment of existing and potential landslide hazards resulting from the April 25, 2015 Gorkha, Nepal earthquake sequence

On April 25, 2015, a large ( M7.8) earthquake shook much of central Nepal and was followed by a series of M>6 aftershocks, including a M7.3 event on May 12, 2015. This earthquake and aftershocks, referred to as the Gorkha earthquake sequence, caused thousands of fatalities, damaged and destroyed entire villages, and displaced millions of residents. The earthquakes also triggered thousands of landslides in the exceedingly steep topography of Nepal; these landslides were responsible for hundreds of fatalities, and blocked vital roads and trails to affected villages. With the support of the United States Agency for International Development (USAID), Office of Foreign Disaster Assistance (OFDA), and in collaboration with earthquake-hazard organizations from both the United States and Nepal, the U.S. Geological Survey (USGS) responded to this crisis by providing landslide-hazard expertise to Nepalese agencies and affected villages. During these assessments, over 11 hours of helicopter-based video coverage of earthquake-affected areas was collected. A report available on-line provides a report on landslide assessments conducted by the USGS. The video resources contained herein provide high resolution coverage of approximately 1,000 kilometers (km) of river valleys and surrounding terrain affected by the Gorkha earthquake sequence.

2015年4月25日，一场震级M7.8的大地震撼动尼泊尔中部广大区域，随后发生了一系列震级大于6的余震，其中包括2015年5月12日的M7.3级地震。此次地震及余震统称为廓尔喀地震序列，共造成数千人遇难，大量村庄被损毁或严重破坏，数百万居民流离失所。此次地震还在尼泊尔极度陡峭的地形中引发数千处滑坡，这些滑坡不仅造成数百人遇难，还阻断了通往受灾村庄的关键道路与步道。在美国国际开发署（United States Agency for International Development, USAID）外国灾害援助办公室（Office of Foreign Disaster Assistance, OFDA）的支持下，美国地质调查局（U.S. Geological Survey, USGS）与美尼两国的地震灾害相关机构开展合作，针对此次危机向尼泊尔官方机构及受灾村庄提供了滑坡灾害应急专业技术支持。在本次灾害评估过程中，工作组采集了时长超11小时的地震受灾区域直升机航拍视频资料。美国地质调查局（USGS）在线发布了一份关于本次滑坡灾害评估的专项报告。本数据集收录的视频资源，对廓尔喀地震序列影响范围内约1000公里的河谷及周边地形进行了高分辨率航拍覆盖。