Small Grants for Exploratory Research: Collaborative Project: Rapid Response to the November 14, 2001 Kunlun Fault Earthquake

2001年11月14日发生在西藏昆仑断裂带的Mw~7.9级地震，美国阿拉斯加大学、加州大学洛杉矶分校和中国地震局的科学家们正在进行快速响应。这次地震提供了一个独特的机会来测量发生在一个已知相对站点速度约为1毫米/年的已有大地测量网内的M~8级地震的震后变形。中国地震局在地震发生一周后，在断层附近建立了三个连续记录的GPS站点，在距离断层约150公里的地方建立了第四个GPS站点。2001年12月对青藏公路沿线的17个现有和新建GPS站点进行了调查。第二项实地工作是从青藏公路向西扩展GPS网络，在近场地表破裂两侧的断层沿线增加新的站点。这项调查在11月至12月期间对所有被调查的地点进行了重复测量，提供了初步的震后结果。这些测量结果将有助于更好地理解青藏高原北部异常厚的地壳流变结构，以及这样一个大事件引发的震后过程。

EAR-0209434/EAR-0209892Shen Zheng-Kang/FreymuellerScientist from the University of Alaska, University of California Los Angeles, and the China Seismological Bureau are carrying out a a rapid response to the November 14, 2001 Mw~7.9 Kunlun fault earthquake in Tibet. This earthquake provides a unique opportunity to measure the postseismic deformation of an M~8 earthquake that occurred within a pre-existing geodetic network in which relative site velocities are known to about 1 mm/yr., Three continuously recording GPS sites near the rupture and a fourth about 150 km away were established one week after the event by the China Seismological Bureau. Also, 17 existing and new GPS sites along the Qinghai-Tibet highway were surveyed in December, 2001. A second field campaign is extending GPS network westward from the Qinghai-Tibet highway, adding new sites along the fault on either side of surface rupture in the near field. This survey is repeating measurements at all of the sites surveyed in November-December, providing the initial postseismic results. These measurements will lead to a better understanding of the rheological structure of the exceptionally thick northern Tibetan crust as well as the postseismic processes triggered by such a large event.