Scaling relation between earthquake magnitude and the departure time from P wave similar growth

Geophysical Research Letters
By:  and 

Links

Abstract

We introduce a new scaling relation between earthquake magnitude (M) and a characteristic of initial P wave displacement. By examining Japanese K-NET data averaged in bins partitioned by Mw and hypocentral distance, we demonstrate that the P wave displacement briefly displays similar growth at the onset of rupture and that the departure time (Tdp), which is defined as the time of departure from similarity of the absolute displacement after applying a band-pass filter, correlates with the final M in a range of 4.5 ≤ Mw ≤ 7. The scaling relation between Mw and Tdp implies that useful information on the final M can be derived while the event is still in progress because Tdp occurs before the completion of rupture. We conclude that the scaling relation is important not only for earthquake early warning but also for the source physics of earthquakes.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Scaling relation between earthquake magnitude and the departure time from P wave similar growth
Series title Geophysical Research Letters
DOI 10.1002/2016GL070069
Volume 43
Issue 17
Year Published 2016
Language English
Publisher American Geophysical Union
Contributing office(s) Earthquake Science Center
Description 8 p.
First page 9053
Last page 9060