NDLI: Source characteristics of the deep Philippine earthquake cluster, 23 and 24 July 2010

Content Provider	Springer Nature Link
Author	Zhang, Junwei Xu, Yan
Copyright Year	2012
Abstract	We determine the rupture velocity, rupture area, stress drop and duration of four strong deep-focus earthquakes in the Philippines by back-projecting the teleseismic P waves. Four deep-focus earthquakes occurred in a totally consumed Molucca microplate; their focal depths were greater than 550 km and their moment magnitudes were between M $_{w}$ 6.6 and M $_{w}$ 7.6. By studying this deep-focus cluster, we are able to estimate the rupture velocity, rupture area and stress drop which would assist in constraining the physical mechanism for earthquakes deeper than 500 km. Since the Molucca microplate is totally consumed, little evidence is left on the surface for us to do research. This deep-focus cluster provides us the opportunity to reveal the properties of this totally consumed microplate by using seismic method for the first time. Four earthquakes in this deep-focus cluster all have multiple rupture subevents. The M $_{w}$ 7.3 event ruptures in two subevents, the M $_{w}$ 7.6 and M $_{w}$ 7.4 events both have three subevents. The M $_{w}$ 6.6 event has single peak on the amplitude as a function of time; however, its energy releases at two spatially separated areas. Our results show that this deep-focus cluster has a slow rupture velocity which is about 0.27 to 0.43 of the shear wave velocity, long-scaled duration, concentrated energy release area, and high stress drop. These source properties are similar to those of other deep earthquakes occurring in warm slabs and indicate that the totally consumed Molucca microplate possibly is a warm plate.
Starting Page	275
Ending Page	289
Page Count	15
File Format	PDF
ISSN	13834649
Journal	Journal of Seismology
Volume Number	16
Issue Number	2
e-ISSN	1573157X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Back-projection Deep earthquake Philippines Molucca plate Structural Geology Geophysics/Geodesy Hydrogeology Geotechnical Engineering & Applied Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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