Vol. 33 No. 2 (1994)
Articles

Sismicidad de la zona de fracturas de Clarión y sus posibles implicaciones tectónicas

Jaime Yamamoto
Instituto de Geofísica, UNAM, México

Published 1994-04-01

Keywords

  • Seismicity,
  • Clarion Fractures,
  • Mexico.
  • Sismicidad,
  • fracturas de Clarión,
  • México.

How to Cite

Yamamoto, J. (1994). Sismicidad de la zona de fracturas de Clarión y sus posibles implicaciones tectónicas. Geofísica Internacional, 33(2), 199-209. https://doi.org/10.22201/igeof.00167169p.1994.33.2.469

Abstract

A sequence of earthquakes (3.4 ≤ Ms ≤ 6.4) occurred from September 15th, 1984 to May 28th, 1986 near the eastern end of the Clarion fracture zone, 30 km to the NNE of Clarion Island in the Revillagigedo Archipelago. The seismic events were located by the ISC between 18.9°-20.4° N and 115.1° -116.9°W. This sequence represents the largest seismic activity during the period 1900-1989 in a region believed to be aseismic. Fault plane solutions for the six larger events were studied using ï¬rst arrivals. All solutions suggest normal faulting with two possible fault planes, one oriented NE-SW with an small right lateral component and the other almost E-W and left lateral component. The ï¬rst solution agrees with the trend of the epicenter distribution; however, it is difficult to reconcile with the morphology of the ocean floor since it is oblique to the general trend of the Clarion fracture zone. Several possible explanations of the seismic sequence are discussed.