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Simultaneous inversion of moderate e...

Salzberg, David Harold.

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Simultaneous inversion of moderate earthquakes using body and surface waves: Methodology and applications to the study of the tectonics of Taiwan.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Simultaneous inversion of moderate earthquakes using body and surface waves: Methodology and applications to the study of the tectonics of Taiwan./
作者:	Salzberg, David Harold.
面頁冊數:	272 p.
附註:	Source: Dissertation Abstracts International, Volume: 57-08, Section: B, page: 4944.
Contained By:	Dissertation Abstracts International57-08B.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9701153
ISBN:	9780591074314

Simultaneous inversion of moderate earthquakes using body and surface waves: Methodology and applications to the study of the tectonics of Taiwan.
Salzberg, David Harold.

Simultaneous inversion of moderate earthquakes using body and surface waves: Methodology and applications to the study of the tectonics of Taiwan. - 272 p.

Source: Dissertation Abstracts International, Volume: 57-08, Section: B, page: 4944.

Thesis (Ph.D.)--State University of New York at Binghamton, 1996.

To understand the role of the deformation in the oceanic lithosphere, I have analyzed focal mechanisms from moderate (4.7 $<$ Mw $<$ 5.5) events by simultaneously inverting regional surface waves (e.g., Patton, 1988) and teleseismic body waves (e.g., Langston, 1981) for the moment tensor. To remove errors introduced by variable paths when using intermediate period (10 $<$ T $<$ 60 seconds) surface waves, empirical Green's functions are employed. These are obtained by stacking normalized surface waves from several Ms $\sim$ 6 earthquakes. The normalization removed the effect of source geometry by the deconvolution of the surface wave excitation determined for a specific seismic moment tensor and source depth. The moment tensor and depth are determined independently using body-waves. Examples of applying this joint inversion method show that both the moment tensors and the depths are resolved better than by using body or surface waves alone.

ISBN: 9780591074314Subjects--Topical Terms:

535228
Geophysics.

Simultaneous inversion of moderate earthquakes using body and surface waves: Methodology and applications to the study of the tectonics of Taiwan.
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245 1 0 $a Simultaneous inversion of moderate earthquakes using body and surface waves: Methodology and applications to the study of the tectonics of Taiwan.
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500 $a Source: Dissertation Abstracts International, Volume: 57-08, Section: B, page: 4944.
502 $a Thesis (Ph.D.)--State University of New York at Binghamton, 1996.
520 $a To understand the role of the deformation in the oceanic lithosphere, I have analyzed focal mechanisms from moderate (4.7 $<$ Mw $<$ 5.5) events by simultaneously inverting regional surface waves (e.g., Patton, 1988) and teleseismic body waves (e.g., Langston, 1981) for the moment tensor. To remove errors introduced by variable paths when using intermediate period (10 $<$ T $<$ 60 seconds) surface waves, empirical Green's functions are employed. These are obtained by stacking normalized surface waves from several Ms $\sim$ 6 earthquakes. The normalization removed the effect of source geometry by the deconvolution of the surface wave excitation determined for a specific seismic moment tensor and source depth. The moment tensor and depth are determined independently using body-waves. Examples of applying this joint inversion method show that both the moment tensors and the depths are resolved better than by using body or surface waves alone.
520 $a By applying this method to 40 moderate earthquakes, I am able to image some aspects of the internal deformation, both at the suture and in the oceanic lithosphere. Comparisons of the focal mechanisms with aftershock seismicity indicate that, in the few cases where causative faults could be determined, there is probably conjugate reverse faulting in the oceanic lithosphere. In fact, all of the reverse mechanisms in the oceanic lithosphere are consistent with conjugate faulting.
520 $a Re-analysis of the aftershocks of the November 14, 1986 earthquake (Wu et al., 1989) shows that the event ruptures a northwest-dipping plane, which implies that the oceanic crust of the Philippine Sea Plate is underthrusting the continental crust. Examination of the spatial distribution of the newly obtained focal mechanisms and the background seismicity indicates that, south of the November 14 hypocenter, there is shallow (depths $<$30 km) conjugate faulting, but there is no evidence for underthrusting. There is also conjugate faulting north of the hypocenter; in addition, the background seismicity is consistent with the oceanic crust's underthrusting the deformed continental crust to a depth of 70 $\pm$ 10 km.
520 $a Since the orogeny is younger in the south than in the north, these sections are also time lines of the orogeny (Teng, 1990). Thus, the oceanic lithosphere appears to thicken through conjugate faulting. As the oceanic lithosphere thickens, it comes into contact with deep weaker material on the continental margin. This results in a fault where the oceanic crust underthrusts the continental margin. Analysis of aftershocks shows an n aftershock alignment from the November 14, 1986 $\rm(M\sb{W}=7.5)$ thrust event indicates that the even occurred on the underthrust. In addition, it is likely that south of this event, the underthrust has not yet developed.
520 $a While the relationship between the underthrust and the Ryukyu subduction remains unclear, the presence of the latter clearly influences the deformation of the Philippines Sea Plate. In fact, the focal mechanisms from events east of Taiwan are mostly consistent with those expected from the subduction. Moreover, there are strike-slip focal mechanisms southeast of Taiwan that show east-west oriented P-axes and north-south oriented T-axes. These mechanisms, coupled with the presence of the Ryukyu subduction 100 km to the north, support Wu's (1978) hypothesis of northward escape of the oceanic lithosphere into the Ryukyu Subduction Zone. (Abstract shortened by UMI.).
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793 $a English
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