Faulting Parameters of Earthquakes (4.1 &lt;= ML &lt;= 5.3) in the Peninsular Ranges of Baja California, Mexico

Vidal, Antonio; Munguía, Luis; Gonzalez-Garcia, J. J.

doi:10.1785/gssrl.81.1.44

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…This SD depends on the number of stations used to estimate M L . Because the number of stations of the regional networks has increased since the study of Vidal and Munguia (1991), we expect smaller SD for our events. Nevertheless, the value of 0:21 is used to estimate upper and lower limits of the P 0 ratio based on equation 3.…”

Section: Spectral Ratiosmentioning

confidence: 91%

“…Faults referred to in the text from west to east: LS, Laguna Salada fault; B, Borrego fault; P, Pescadores fault; C, Cucapah fault. Vidal and Munguia (1991) compared local magnitudes reported by the U.S. Geological Survey and the California Institute of Technology and found that the estimates of M L from earthquakes in Baja California, México, have a standard deviation (SD) of 0:21. This SD depends on the number of stations used to estimate M L .…”

Section: Spectral Ratiosmentioning

confidence: 99%

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Potential Signatures of Damage-Related Radiation from Aftershocks of the 4 April 2010 (Mw 7.2) El Mayor-Cucapah Earthquake, Baja California, Mexico

Castro

Ben‐Zion

2013

Bulletin of the Seismological Society of America

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We observe enhanced high-frequency radiation of P waves from aftershocks of the 4 April 2010 (M w 7.2), El Mayor-Cucapah, Baja California, earthquake that may reflect isotropic radiation generated by rock damage in the source regions. To eliminate path, radiation pattern, and site effects we use spectral ratios of four pairs of collocated events with similar size and focal mechanism that occurred within short time intervals (less than 24 hrs) and were recorded at the same stations. The P=P and the S=S spectral ratios calculated for the selected pairs of events show that events with similar size may have differences of high-frequency radiation up to a factor of 4 at 10 Hz and up to a factor of 10 at 4 Hz for P and S waves, respectively. To evaluate the differences between P-and S-wave energy radiated at high frequencies, we calculate the P=P=S=S ratio of the ratios at high frequencies (f > 1:5 Hz) in a band for which the signal-to-noise ratio is adequate. Since the pairs of used events have approximately the same size, the ratio of ratios is expected to be near unity. We observed high P=P=S=S spectral ratios at high frequencies (f > 6 Hz), up to a factor of 9, which may reflect isotropic radiation associated with rock damage. To find additional possible signatures of rock damage, we evaluate changes of coda Q using the same data. The results show small change of Q for a doublet located on the Laguna Salada fault. However, for the doublets located south of the Sierras El Mayor-Cucapah, where there was no surface rupture before the sequence, changes of Q at 5 Hz by a factor of about 3 indicate significant temporal variations of rock properties along the source-receiver path.

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Section: Spectral Ratiosmentioning

confidence: 91%

Section: Spectral Ratiosmentioning

confidence: 99%

Potential Signatures of Damage-Related Radiation from Aftershocks of the 4 April 2010 (Mw 7.2) El Mayor-Cucapah Earthquake, Baja California, Mexico

Castro

Ben‐Zion

2013

Bulletin of the Seismological Society of America

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An earthquake focal mechanism catalog for source and tectonic studies in Mexico from February 1928 to July 2022

Rodríguez-Pérez,

Zúñiga

2023

Earth Syst. Sci. Data

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Abstract. We present a focal mechanism catalog for earthquakes that occurred in Mexico and surrounding areas reported from February 1928 to July 2022. The magnitude of the events varies from −0.9 to 8.2. The hypocentral depth is in the range of 0 < Z < 270 km. Focal mechanisms in this catalog are associated with tectonic, geothermal, and volcanic environments. Reported focal mechanisms were derived using different types of data at local, regional, and teleseismic distances and different methods such as first motions, composite solutions, waveform analysis, and moment tensor inversion. So far, focal mechanism data for earthquakes in Mexico are dispersed over many publications without any link among them. For this reason, we collect and revise focal mechanism solutions previously reported by different agencies and studies from published sources. Our catalog consists of 7664 focal mechanism solutions for a total of 5701 events since we report all the available focal mechanisms obtained by different authors and seismological agencies for each seismic event. Additionally, we classify the focal mechanisms according to their fault types using the ternary diagrams of Kaverina-type classification. We also rank the quality of the focal mechanism data into three categories: A, B, and C. A represents good/reliable data, B represents satisfactory data, and C represents poor/questionable data according to well-defined criteria. The main goal of this study is to provide a comprehensive compilation of focal mechanism data that can help in future source and tectonic studies in Mexico. The earthquake focal mechanism catalog described in this article is available at https://doi.org/10.6084/M9.FIGSHARE.21663668.V1 (Rodríguez-Pérez and Zúñiga, 2022).

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Faulting Parameters of Earthquakes (4.1 <= ML <= 5.3) in the Peninsular Ranges of Baja California, Mexico

Cited by 2 publications

References 16 publications

Potential Signatures of Damage-Related Radiation from Aftershocks of the 4 April 2010 (Mw 7.2) El Mayor-Cucapah Earthquake, Baja California, Mexico

Potential Signatures of Damage-Related Radiation from Aftershocks of the 4 April 2010 (Mw 7.2) El Mayor-Cucapah Earthquake, Baja California, Mexico

An earthquake focal mechanism catalog for source and tectonic studies in Mexico from February 1928 to July 2022

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