Aftershock source mechanisms from the June 9, 1994, deep Bolivian earthquake

M. A. Tinker, T. C. Wallace, Susan Beck, P. G. Silver, George Zandt

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The Mw 8.3 Bolivia earthquake occurred on June 9, 1994, at a depth of 636 km. This is the largest deep event in recorded history and ruptured a portion of the down-going Nazca slab unknown to have ruptured previously. The main shock and aftershocks were recorded on the BANJO and SEDA portable, broadband seismic arrays in Bolivia. A grid search technique was used to determine focal mechanisms for 12 of 36 recorded aftershocks ranging in magnitude from 2.7 to 5.3. The aftershock focal mechanisms indicate a rotation of the P-axis within the slab from down-dip compression prior to the main shock to a near-vertical direction afterwards. This observation is consistent with the release of shear stress on the near-horizontal rupture plane and the subsequent rotation of the maximum compressive stress to a fault-normal orientation. -from Authors

Original languageEnglish (US)
Pages (from-to)2273-2276
Number of pages4
JournalGeophysical Research Letters
Volume22
Issue number16
DOIs
StatePublished - 1995

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Bolivia
aftershock
slabs
earthquakes
shock
focal mechanism
earthquake
slab
shear stress
grids
histories
broadband
normal fault
rupture
dip
compression
history

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Aftershock source mechanisms from the June 9, 1994, deep Bolivian earthquake. / Tinker, M. A.; Wallace, T. C.; Beck, Susan; Silver, P. G.; Zandt, George.

In: Geophysical Research Letters, Vol. 22, No. 16, 1995, p. 2273-2276.

Research output: Contribution to journalArticle

Tinker, M. A. ; Wallace, T. C. ; Beck, Susan ; Silver, P. G. ; Zandt, George. / Aftershock source mechanisms from the June 9, 1994, deep Bolivian earthquake. In: Geophysical Research Letters. 1995 ; Vol. 22, No. 16. pp. 2273-2276.
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