Abstract:In this paper, we use several stations’ high-rate GNSS observations of the strong earthquakes in Japan on March 11, 2011 and in Wenchuan May 12, 2008 to get the displacement waveforms during the events by means of Precise Point Positioning. From the first-difference displacement waveforms, we get the high-rate GNSS velocity time series, then we use their S transform spectrums to identify seismic phases and pick up the arriving times. The pickup results are applied for the inversion of the epicenter location and the origin time. Compared with the data published by USGS, the difference of the Japanese earthquake epicenter location is about 16 km, the origin time difference is about 0.7 s; the epicenter location difference of Wenchuan event is about 4 km, and origin time difference is about 0.4 s.
$author.xingMing_EN,$author.xingMing_EN,$author.xingMing_EN et al. Seismic Phases Identification and Epicenter Determination of Strong Earthquakes with High-Rate GNSS Data[J]. jgg, 2016, 36(4): 364-367.