Static Displacement and Long-Period Velocity Pulse of Crustal Earthquakes in Japan

Abstract

We extract static displacement and long-period (2 to 10 s) velocity pulse from strong motion records of crustal earthquakes in Japan and examine them by comparing with previous prediction equations and those of the 2016 Kumamoto earthquake. The period of long-period pulse of four earthquakes with Mw 6.6 to 7 is around 3 s, which is consistent to one of previous equations although Mw dependency is weaker. Predictions of the static displacement are improved by introducing the relation between seismic moment M₀ and fault rupture area S derived in this study using fault models estimated from geodetic data to a previous equation instead of the M₀-S relation by Wells and Coppersmith (1994).