東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Navigating Earthquake Physics with H...

Meng, Lingsen.

Linked to FindBook

Google Book

Amazon

博客來

Navigating Earthquake Physics with High-Resolution Array Back-Projection.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Navigating Earthquake Physics with High-Resolution Array Back-Projection./
Author:	Meng, Lingsen.
Description:	185 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
Contained By:	Dissertation Abstracts International75-02B(E).
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3598567
ISBN:	9781303472572

Navigating Earthquake Physics with High-Resolution Array Back-Projection.
Meng, Lingsen.

Navigating Earthquake Physics with High-Resolution Array Back-Projection. - 185 p.

Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.

Thesis (Ph.D.)--California Institute of Technology, 2013.

Understanding earthquake source dynamics is a fundamental goal of geophysics. Progress toward this goal has been slow due to the gap between state-of-art earthquake simulations and the limited source imaging techniques based on conventional low-frequency finite fault inversions. Seismic array processing is an alternative source imaging technique that employs the higher frequency content of the earthquakes and provides finer detail of the source process with few prior assumptions. While the back-projection provides key observations of previous large earthquakes, the standard beamforming back-projection suffers from low resolution and severe artifacts. This thesis introduces the MUSIC technique, a high-resolution array processing method that aims to narrow the gap between the seismic observations and earthquake simulations.

ISBN: 9781303472572Subjects--Topical Terms:

535228
Geophysics.

Navigating Earthquake Physics with High-Resolution Array Back-Projection.
LDR:03065nam a2200277 4500 001 1965603
005 20141030134124.5
008 150210s2013 ||||||||||||||||| ||eng d
020 $a 9781303472572
035 $a (MiAaPQ)AAI3598567
035 $a AAI3598567
040 $a MiAaPQ $c MiAaPQ
100 1 $a Meng, Lingsen. $3 2102281
245 1 0 $a Navigating Earthquake Physics with High-Resolution Array Back-Projection.
300 $a 185 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
500 $a Adviser: Jean-Paul Ampuero.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2013.
520 $a Understanding earthquake source dynamics is a fundamental goal of geophysics. Progress toward this goal has been slow due to the gap between state-of-art earthquake simulations and the limited source imaging techniques based on conventional low-frequency finite fault inversions. Seismic array processing is an alternative source imaging technique that employs the higher frequency content of the earthquakes and provides finer detail of the source process with few prior assumptions. While the back-projection provides key observations of previous large earthquakes, the standard beamforming back-projection suffers from low resolution and severe artifacts. This thesis introduces the MUSIC technique, a high-resolution array processing method that aims to narrow the gap between the seismic observations and earthquake simulations.
520 $a The MUSIC is a high-resolution method taking advantage of the higher order signal statistics. The method has not been widely used in seismology yet because of the nonstationary and incoherent nature of the seismic signal. We adapt MUSIC to transient seismic signal by incorporating the Multitaper cross-spectrum estimates. We also adopt a "reference window" strategy that mitigates the "swimming artifact," a systematic drift effect in back projection. The improved MUSIC back projections allow the imaging of recent large earthquakes in finer details which give rise to new perspectives on dynamic simulations. In the 2011 Tohoku-Oki earthquake, we observe frequency-dependent rupture behaviors which relate to the material variation along the dip of the subduction interface. In the 2012 off-Sumatra earthquake, we image the complicated ruptures involving orthogonal fault system and an usual branching direction. This result along with our complementary dynamic simulations probes the pressure-insensitive strength of the deep oceanic lithosphere. In another example, back projection is applied to the 2010 M7 Haiti earthquake recorded at regional distance. The high-frequency subevents are located at the edges of geodetic slip regions, which are correlated to the stopping phases associated with rupture speed reduction when the earthquake arrests.
590 $a School code: 0037.
650 4 $a Geophysics. $3 535228
690 $a 0373
710 2 $a California Institute of Technology. $b Geophysics. $3 2102230
773 0 $t Dissertation Abstracts International $g 75-02B(E).
790 $a 0037
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3598567