Relationship between shallow- and intermediate-depth seismicity in the eastern Aleutian subduction zone

Details Relationship between shallow- and intermediate-depth seismicity in the eastern Aleutian subduction zone Relationship between shallow- and intermediate-depth seismicity in the eastern Aleutian subduction zone

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2019a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 20, p. 2019-2022.

Mathematics

Logic

25

Earthquakes, Seismology, Subduction (Geology), Tectonics, Aleutian Islands (Us), Geological Faults, Ray Tracing, Three Dimensional Models

Scientific paper

In order to elucidate the transition from shallow interplate thrusting to intermediate-depth seismicity, 1448 earthquakes are relocated from data recorded by a regional seismic network in the eastern Aleutian arc, using an improved 3D velocity model and accurate ray tracing. Single-event first-motion solutions are determined from these rays for 31 slab events. The interplate thrust zone is a planar fault zone, dipping 10-15 deg at 25-35 km depth, and is no more than 5-10 km wide. Fault-plane solution orientations for these events vary by several tens of degrees in orientation, although 73 percent show T axes aligned within 45 deg of the slab dip. A parallel seismic zone, 20-25 km deeper into the slab, also shows down-dip plunges of T axes for 3 of 5 solutions. Hypocenters show that intermediate-depth events are confined near the subducted oceanic crust, supporting compositional rather than pure thermal control of intermediate-depth seismicity. It is argued that the upper-plane events are an indirect consequence of phase changes in subducted crust.

Affiliated with

Also associated with

No associations

Rating

Relationship between shallow- and intermediate-depth seismicity in the eastern Aleutian subduction zone does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Relationship between shallow- and intermediate-depth seismicity in the eastern Aleutian subduction zone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relationship between shallow- and intermediate-depth seismicity in the eastern Aleutian subduction zone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1869992