Variations of b-values preceding large earthquakes in the Andaman-Sumatra subduction zone
2012 (English)In: Journal of Asian Earth Sciences, ISSN 1367-9120, Vol. 61, no SI, 237-242 p.Article in journal (Refereed) Published
Fifteen largest earthquakes, M-w >= 7, occurring between 2000 and 2010 in the Andaman-Sumatra region are studied. The available USGS list of events used is complete for a threshold magnitude M-c = 4.5 and contains 6973 shocks. Spatial and temporal variation of b-values, in the Gutenberg-Richter formula log N = a - bM, was investigated in six selected epicentral regions. The technique of moving spatial- and time-windows was applied. Deduced b-values show large variations from 0.55 to 2.40. The 15 largest events all took place within regions of low b and were preceded by significant drops in b-values. Observed correspondence between low b and the occurrence of large earthquakes suggests that b(t) has a potential which could be employed in a medium term (months, years) earthquake prediction.
Place, publisher, year, edition, pages
2012. Vol. 61, no SI, 237-242 p.
b-value, Andaman-Sumatra earthquakes, Earthquake precursor, Temporal variation of b-value, Spatial variation of b-value
IdentifiersURN: urn:nbn:se:uu:diva-196098DOI: 10.1016/j.jseaes.2012.10.013ISI: 000314004800017OAI: oai:DiVA.org:uu-196098DiVA: diva2:609219