Determinations of focal depths of earthquakes associated with the bending of oceanic plates at trenches

Details Determinations of focal depths of earthquakes associated with the bending of oceanic plates at trenches Determinations of focal depths of earthquakes associated with the bending of oceanic plates at trenches

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...28..141f&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 28, Issue 2, p. 141-160.

Physics

42

Scientific paper

The earthquakes examined in this paper are all within the oceanic lithosphere and are associated with the bending of plates before subduction. Accurate determinations of the depth of these earthquakes are needed to study the stress pattern within a bending plate. Routinely-determined depths of shallow sub-oceanic earthquakes published in bulletins are unreliable. The depths can be accurately determined to within a few kilometers if the original seismograms from these events are studied. In some cases, the reflected phases pP and pwP can be clearly identified. There exists the possibility that the wave reflected at the water-air interface, pwP, may be misidentified as pP, leading to erroneous estimates of depth. Additional methods of analysis, such as surface wave radiation patterns or the apparent frequency-dependence of reflection at the crust-water interface, can remove this possible source of confusion. One of the most powerful techniques for depth analysis is the modelling of long-period waveforms. The pattern of stresses within the bending oceanic lithosphere revealed by the depths and focal mechanisms of these intraplate earthquakes is one of horizontal, deviatoric tension down to a depth of about 25 km, with horizontal compression at greater depths.

Affiliated with

Also associated with

No associations

Rating

Determinations of focal depths of earthquakes associated with the bending of oceanic plates at trenches 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 Determinations of focal depths of earthquakes associated with the bending of oceanic plates at trenches, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determinations of focal depths of earthquakes associated with the bending of oceanic plates at trenches will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1101698