Characteristics of strong ground motions from four MS ≥ 5.0 earthquakes in the 2021 Yangbi, southwest China, seismic sequence

A seismic sequence has hit the Yangbi county, west part of Yunnan Province in southwest China since 18 May 2021. This region experienced the strongest ground shakings at the night of 21 May with the successive occurrence of four earthquakes with <em>M</em>S ≥ 5.0 in a short time and more small earthquakes. The <em>M</em>s 6.4 event was well recorded by dense ground-motion observation stations, including the national strong-motion stations and seismic intensity stations. Totally, 550 three-component acceleration recordings were well processed and the ground motion intensity measures (GMIMs) were calculated, including PGAs, PGVs, and 5%-damped PSAs.