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，一场震级为M7.8的强震袭击尼泊尔中部广大区域，随后发生一系列震级大于6级的余震，其中包括2015年5月12日发生的M7.3级地震。这场地震及其余震被称为廓尔喀地震序列（Gorkha earthquake sequence），造成数千人遇难，大量村庄损毁甚至完全被毁，致使数百万居民流离失所。此次地震还在尼泊尔极端陡峭的地形区域触发数千处滑坡，这些滑坡造成数百人遇难，同时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）及其外国灾害援助办公室（Office of Foreign Disaster Assistance, OFDA）的支持下，同时与美国及尼泊尔的地震灾害相关组织开展合作，美国地质调查局（U.S. Geological Survey, USGS）投身此次危机应对，为尼泊尔相关机构与受灾村庄提供滑坡灾害专业技术支撑。在此次评估工作期间，团队收集了超过11小时的直升机航拍视频，覆盖地震受灾区域。一份公开在线发布的报告详细记载了美国地质调查局开展的滑坡评估工作。本数据集包含的视频资源以高分辨率覆盖了约1000千米的河谷及周边受廓尔喀地震序列影响的地形区域。