Spatial variations in the frequency-magnitude distribution of earthquakes in the southwestern Okinawa Trough

Jing Yi Lin, Jean Claude Sibuet, Chao Shing Lee, Shu Kun Hsu, Frauke Klingelhoefer

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The relations between the frequency of occurrence and the magnitude of earthquakes are established in the southern Okinawa Trough for 2823 relocated earthquakes recorded during a passive ocean bottom seismometer experiment. Three high b-values areas are identified: (1) for an area offshore of the Ilan Plain, south of the andesitic Kueishantao Island from a depth of 50 km to the surface, thereby confirming the subduction component of the island andesites; (2) for a body lying along the 123.3°E meridian at depths ranging from 0 to 50 km that may reflect the high temperature inflow rising up from a slab tear; (3) for a third cylindrical body about 15 km in diameter beneath the Cross Backarc Volcanic Trail, at depths ranging from 0 to 15 km. This anomaly might be related to the presence of a magma chamber at the base of the crust already evidenced by tomographic and geochemical results. The high b-values are generally linked to magmatic and geothermal activities, although most of the seismicity is linked to normal faulting processes in the southern Okinawa Trough.

Original languageEnglish
Pages (from-to)221-225
Number of pages5
JournalEarth, Planets and Space
Volume59
Issue number4
DOIs
StatePublished - 2007

Keywords

  • Magma chamber
  • Slab tear
  • Southern Okinawa Trough backarc basin
  • b-Values

Fingerprint

Dive into the research topics of 'Spatial variations in the frequency-magnitude distribution of earthquakes in the southwestern Okinawa Trough'. Together they form a unique fingerprint.

Cite this