Slab-induced waveform effects as revealed by the TAIGER seismic array: Evidence of slab beneath central Taiwan

Details Slab-induced waveform effects as revealed by the TAIGER seismic array: Evidence of slab beneath central Taiwan Slab-induced waveform effects as revealed by the TAIGER seismic array: Evidence of slab beneath central Taiwan

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012pepi..196...62c&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 196, p. 62-74.

Physics

Scientific paper

Here we tackle a tectonically important question - the upper mantle velocity structure beneath central Taiwan - with seismically interesting observations - receiver-side slab waveform effects. We use teleseismic P waveforms of the NS broadband array deployed by the TAIGER project to examine patterns of variation in arrival time, pulse width, and amplitude - measuring the first two by Gaussian fitting - and contrast measurements of earthquakes to the southeast (SE earthquakes) with those of one Sumatra earthquake in order to focus on upper mantle heterogeneities. Overall variation patterns as a function of earthquake are compatible with ray-tracing predictions. Relative reduced arrival times and amplitudes at central Taiwan stations suggest the existence of a deep aseismic slab below. From simulations of 2-D wave propagation, we conclude that lateral heterogeneity of crust and uppermost mantle primarily contributes to variations in arrival time and only secondarily to variations in amplitude and pulse width. Furthermore, discrepancies between source-side and receiver-side waveform effects, where the latter are not always amplitude-reduced, are explained by constructive interference between the fast and slow phase. Thus, the use of full waveform information can provide independent constraints to complement results of previous studies. A future extension will be to incorporate S waves and apply waveform inversion to yield quantitative constraints.

Affiliated with

Also associated with

No associations

Rating

Slab-induced waveform effects as revealed by the TAIGER seismic array: Evidence of slab beneath central Taiwan 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 Slab-induced waveform effects as revealed by the TAIGER seismic array: Evidence of slab beneath central Taiwan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Slab-induced waveform effects as revealed by the TAIGER seismic array: Evidence of slab beneath central Taiwan will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1119404