Abstract
北京时间2020年5月22日2时，中国青海省果洛州玛多县发生Mw 7.4地震。收集震中附近9个连续运行卫星定位基准站(continuously operating reference stations，CORS)观测数据，基于模糊度解算的精密单点定位(precise point positioning with ambiguity resolution，PPP-AR)技术处理了2 h时段的高频(1 Hz采样)全球导航卫星系统(global navigation satellite system，GNSS)数据，快速确定本次地震的近场同震位移，其中水平方向最大约为0.6 m。结合远场12个CORS震前、震后各3 d低频(30 s采样)数据的非差PPP解算同震形变场，基于弹性位错模型反演了玛多地震断层几何参数和滑动分布。结果显示：玛多地震属于典型走滑事件，发震断层走向278.49°，倾角为64.38°，滑动角为-10.90°，破裂长度约为138.72 km，宽度为4.82 km；滑动量超过3 m的滑移主要集中在东部小于18 km深度的区域，最大破裂可达4.2 m。反演的地震矩为1.85×1020 Nm，相当于矩震级7.45，比美国地质调查局利用地震波的反演结果略大。
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