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Broadband waveform modeling over a d...

Tan, Ying.

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Broadband waveform modeling over a dense seismic network.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Broadband waveform modeling over a dense seismic network./
Author:	Tan, Ying.
Description:	157 p.
Notes:	Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5624.
Contained By:	Dissertation Abstracts International67-10B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3236249
ISBN:	9780542904561

Broadband waveform modeling over a dense seismic network.
Tan, Ying.

Broadband waveform modeling over a dense seismic network. - 157 p.

Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5624.

Thesis (Ph.D.)--California Institute of Technology, 2006.

This item must not be sold to any third party vendors.

We developed a "two-way" calibration technique for studying clustered events, particularly their mechanisms and rupture directivities. First, we demonstrate that the magnitude 4 events with known source mechanisms can be used to calibrate the path effects on the short-period (0.5-2 sec) P waves, so that the corrected P waves can be modeled for determining focal mechanisms of the smaller events. The correction is formulated in terms of a station-specific "Amplitude Amplification Factor" (AAF), whose origin is mainly due to the site effect. Second, we show that the smaller events with radiation pattern corrections provide excellent empirical Green's functions (EGFs) for investigating the detailed rupture processes of the magnitude 4 events. In this thesis, we present the application of our methods to the 2003 Big Bear sequence.

ISBN: 9780542904561Subjects--Topical Terms:

535228
Geophysics.

Broadband waveform modeling over a dense seismic network.
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020 $a 9780542904561
035 $a (MiAaPQ)AAI3236249
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100 1 $a Tan, Ying. $3 1004107
245 1 0 $a Broadband waveform modeling over a dense seismic network.
300 $a 157 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5624.
500 $a Adviser: Don Helmberger.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2006.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a We developed a "two-way" calibration technique for studying clustered events, particularly their mechanisms and rupture directivities. First, we demonstrate that the magnitude 4 events with known source mechanisms can be used to calibrate the path effects on the short-period (0.5-2 sec) P waves, so that the corrected P waves can be modeled for determining focal mechanisms of the smaller events. The correction is formulated in terms of a station-specific "Amplitude Amplification Factor" (AAF), whose origin is mainly due to the site effect. Second, we show that the smaller events with radiation pattern corrections provide excellent empirical Green's functions (EGFs) for investigating the detailed rupture processes of the magnitude 4 events. In this thesis, we present the application of our methods to the 2003 Big Bear sequence.
520 $a A new technique CAPloc to retrieve full source parameters of small seismic events from regional seismograms is developed, which include origin time, epicenter location, depth, focal mechanism, and moment magnitude. In particular, we tested whether our new method could produce satisfactory results with as few as two stations, so that we can improve source estimates of poorly monitored events with sparse waveform data. We conducted the test in the Tibetan plateau. The focal mechanisms and locations determined from only two stations agree well with those from a well-distributed PASSCAL array.
520 $a We use 49 Tonga-Fiji events recorded at the broadband TriNet array, southern California to develop a pure path upper-mantle shear velocity model. At the epicentral distances of 70°--95°, multi-bounce S waves up to S5, including the guided waves, are observed and modeled to constrain the radial velocity structure. Our preferred model PAC06 contains a fast lid (Vsh = 4.78 km/sec, Vsv = 4.58 km/sec) &sim;60 km thick, and a prominent low velocity zone with the lowest velocities V sh = 4.34 km/sec, and Vsv = 4.22 km/sec. Besides the 406 km and 651 km discontinuities, PAC06 also has a small (&sim;1%) velocity jump at &sim;516 km. We consider these main features of PAC06 to be well determined, since PAC06 explains a large data set from various events. Therefore, it is ideally suited for comparing with mineralogical models.
590 $a School code: 0037.
650 4 $a Geophysics. $3 535228
690 $a 0373
710 2 $a California Institute of Technology. $3 726902
773 0 $t Dissertation Abstracts International $g 67-10B.
790 $a 0037
791 $a Ph.D.
792 $a 2006
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3236249