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Within and Between-Event Variability of Mw 6-7 Earthquakes Velocity Pulses in Taiwan and Japan

Session: Advances in Understanding Near-Field Ground Motions: Observation, Prediction and Application [Poster]

Type: Poster

Date: 4/22/2021

Presentation Time: 11:30 AM Pacific

Description: 

Ground motion with strong-velocity pulses can cause significant damage to buildings and structures. The period and the velocity amplitude of such pulses are critical for structural engineering and seismic hazard assessment. However, the physical factors relating the scaling of pulse periods with magnitude are poorly understood. In this study, we investigate moderate, but damaging earthquakes (Mw 6-7) in Taiwan and Japan. We characterize ground motion pulses by using the method of Shahi and Baker (2014) while taking into account potential static effects. We confirm that the within-event variability of the pulses is large. In addition, we further perform simulations using the frequency-wavenumber (FK) algorithm to investigate the causes of the variability of the pulse periods within and between events. We test the effect of fault dips and the impact of the asperity locations and sizes. The simulations reveal that the asperity properties have a high impact on the pulse periods and amplitudes at nearby stations. Our results emphasize the importance of asperity characteristics in addition to earthquake magnitudes for the occurrence and properties of pulses. We quantify and discuss within- and between-event variabilities of pulse properties at short distances.

Presenting Author: Ming-Hsuan Yen

Student Presenter: Yes

Authors