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的强震袭击了尼泊尔中部广大区域，随后伴随一系列震级大于6级的余震，其中包括2015年5月12日发生的M7.3级强余震。本次地震及后续余震被称为廓尔喀地震序列（Gorkha earthquake sequence），共造成数千人遇难，大量村庄遭到损毁或完全摧毁，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了数千处滑坡灾害，这些滑坡不仅造成数百人死亡，还阻断了通往受灾村庄的重要道路与步道。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，同时与美国及尼泊尔的地震灾害相关组织开展协作，美国地质调查局（U.S. Geological Survey, USGS）投身本次危机应对，向尼泊尔当地机构及受灾村庄提供了滑坡灾害防控专业技术支持。

在此次灾害评估工作期间，团队采集了超过11小时的直升机航拍受灾区域的视频资料。另有一份在线公开报告详细阐述了美国地质调查局开展的滑坡灾害评估工作。本数据集所收录的视频资源，覆盖了廓尔喀地震序列影响范围内约1000千米的河谷及周边地形，画质分辨率极高。