Natural Hazards and Earth System Sciences Underlying mechanism of precursory activity from analysis of upward earthquake migration

Content Provider	Semantic Scholar
Author	Molchanov, O. A.
Copyright Year	2011
Abstract	In this paper we analyse the upward earthquake hypocentral migration in the ten known subduction zones and discuss a possible mechanism of such migration. The total time of the migration appears to range from 2.5 to 10 years. It leads to the estimation of the average velocity V z ∼ 60−300 km yr−1. It probably corresponds to the movement of the forcing agent like stress or deformation wave from depths of the upper mantle (600–700 km) to the level of the lithosphere with subsequent initiation of fluid migration inside the crust to trigger shallow earthquakes. Averaged over all zones upward migration travel time is about 5 years (< V z >≈ 120 km yr−1) that coincides approximately with the period of characteristic temperature variation (El Nino) and crustal seismic periodicity in the Pacific region. These findings are helpful for the study of the seismic precursors and analysis of earthquake triggering.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.nat-hazards-earth-syst-sci.net/11/135/2011/nhess-11-135-2011.pdf
Language	English
Access Restriction	Open
Subject Keyword	Earth system science Earthquakes El Nino Lithosphere Mantle Philips Nino Process migration Quasiperiodicity Scab Transcription Initiation Velocity (software development)
Content Type	Text
Resource Type	Article