Fitting Waveform Envelopes to Derive Focal Mechanisms of Moderate Earthquakes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10384794" target="_blank" >RIV/00216208:11320/18:10384794 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1785/0220170161" target="_blank" >https://doi.org/10.1785/0220170161</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1785/0220170161" target="_blank" >10.1785/0220170161</a>
Alternative languages
Result language
angličtina
Original language name
Fitting Waveform Envelopes to Derive Focal Mechanisms of Moderate Earthquakes
Original language description
Focal mechanisms of shallow crustal earthquakes with magnitude 4 or less remain unresolved in many regions of the world due to the sparseness of seismic networks. Relatively distant stations must be used, but modeling those waveforms is difficult due to imprecision of seismic-velocity models. The waveform inversions also suffer from instrumental problems, such as flipped channel sign and errors in gain or timing. In such situations, waveforms should therefore be substituted by a robust characteristic which still carries information about focal mechanism and moment magnitude. We propose inversion of waveform envelopes. Three application examples demonstrate the performance of the method for earthquakes in various ranges of epicentral distance and frequency. In the examples, the focal mechanisms of the sample earthquakes are known from the waveform inversion approach based on near-source stations. The near-source stations are then ignored completely. Use of the remaining stations fails to provide the true mechanism through waveform inversion, but a correct estimate of the solution is found using envelopes. This method may be of interest to seismologists who need to compute focal mechanisms for stress-field studies in sparse networks, where traditional waveform inversion and amplitude inversion methods often fail.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10500 - Earth and related environmental sciences
Result continuities
Project
<a href="/en/project/LM2015079" target="_blank" >LM2015079: Distributed System of Permanent Observatory Measurements and Temporary Monitoring of Geophysical Fields</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Seismological Research Letters
ISSN
0895-0695
e-ISSN
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Volume of the periodical
89
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
1137-1145
UT code for WoS article
000440583400020
EID of the result in the Scopus database
2-s2.0-85046297180