'Moment tensor' presentation slideshows

832 views • 64 slides

Evaluation of earthquake mechanism through waveform inversion

Evaluation of earthquake mechanism through waveform inversion. S.N. Bhattacharya Dept. of Geology and Geophysics IIT, Kharagpur 721302 email <sn_bhattacharya@hotmail.com. Contents. Shear dislocation & synthetic seismogram Moment tensor and its decomposition

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Thailand Training Program in Seismology and Tsunami Warnings, May 2006

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EARTHQUAKES (2): WAVEFORM MODELING, MOMENT TENSORS, & SOURCE PARAMETERS

EARTHQUAKES (2): WAVEFORM MODELING, MOMENT TENSORS, & SOURCE PARAMETERS. Kikuchi and Kanamori, 1991. SOMETIMES FIRST MOTIONS DON’T CONSTRAIN FOCAL MECHANISM Especially likely when Few nearby stations, as in the oceans, so arrivals are near center of focal sphere

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Symmetry of the Moment Tensor :

Moment Tensor Inversion. Symmetry of the Moment Tensor :. M ij = M ji. Now assume the earthquake is a pure double couple, that means there is no net volume change, which means trace must be 0. M11 + M22 + M33 = 0.

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LECTURE 6: SEISMIC MOMENT TENSORS

LECTURE 6: SEISMIC MOMENT TENSORS Represent other types of seismic sources as well as slip on a fault Give additional insight into the rupture process Simplify inverting (rather than forward modeling ) seismograms to estimate source parameters

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? What is the Earthquake Source? Elastic Rebound Fault Slip ? Double-couple Force

Theoretical Seismology 1: Sources. ? What is the Earthquake Source? Elastic Rebound Fault Slip ? Double-couple Force ? Seismic Moment Tensor ? Models of Earthquake Faults ? Earthquake Size Magnitudes Seismic Moment Energy. What is an Earthquake ?.

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Fault plane solution and moment tensor inversion

Fault plane solution and moment tensor inversion. J. Havskov. Main topics. Fault plane solution Use of polarities Use of polarities and amplitude ratios Regional moment tensor inversion using waveforms Practical demonstration. Focal mechanism parameters. Strike: Direction of the fault

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Earthquake Focal Mechanisms

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Theoretical aspects of seismic waves and sources Massimo Cocco INGV

Theoretical aspects of seismic waves and sources Massimo Cocco INGV. Earthquakes produce effects to the environment & the society. Damages are produced by severe ground shaking due to seismic waves and local site amplifications and by the vulnerability of buildings and human constructions.

443 views • 27 slides

Source Moment Tensor Solutions from Waveform Inversion Case study of Jabalpur event

Source Moment Tensor Solutions from Waveform Inversion Case study of Jabalpur event. - G.Karunakar, S.N. Bhattacharya & J.R. Kayal. Seismogram. Epicentral Distance ( ?). Receiver. Vp=4.55 km/s Vs=2.55 km/s density= 2.6 g/cm3. Source Depth (d). Vp=4.55 km/s Vs=2.55 km/s

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A Two-Step Time-Frequency Moment Tensor Inversion: Application to Mining Data

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Moment tensor inversion using observations of unknown amplification

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CISN: Draft Plans for 2005- 2008

CISN: Draft Plans for 2005- 2008. Funding Sources: OES/FEMA/ANSS/Others CISN-PMG. Sacramento 10/19/2004. 1 ) Continue to operate the statewide earthquake monitoring and ShakeMap generation facilities.

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CISN: Draft Plans for 2005- 2008

CISN: Draft Plans for 2005- 2008. Funding Sources: OES/FEMA/ANSS/Others CISN-PMG. Sacramento 10/19/2004. 1 ) Continue to operate the statewide earthquake monitoring and ShakeMap generation facilities.

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