A surface-wave investigation of the rupture mechanism of the Gobi-Altai (December 4, 1957) earthquake

Emile A. Okal

doi:10.1016/0031-9201(76)90027-3

A surface-wave investigation of the rupture mechanism of the Gobi-Altai (December 4, 1957) earthquake

Emile A. Okal^*

^*Corresponding author for this work

Earth and Planetary Sciences

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Long-period records of multiple Love waves from the 1957 earthquake in Mongolia (M_S = 8.0) at Pasadena are analysed and compared to synthetic seismograms, generated by the method of Kanamori. A fit in the time domain shows that the records are not consistent with the previous solution, achieved through a frequency-domain analysis of directivity by Ben-Menahem and Toksöz. The solution asks for a shorter rupture of 270 km at a velocity of 3.5 km/s. The focal parameters are constrained by updating all the reported first motion and are found to be: strike = 103°, dip = 53°, slip = 32°. A seismic moment of 1.8 · 10²⁸ dyn · cm is obtained. These figures are also consistent with a time-domain analysis of Love waves at Palisades and Strasbourg, and of Rayleigh waves at Pasadena, with a directivity study of Love waves at Pasadena, and with static deformation and isoseismal data. A discussion is given of the relation between moment, magnitude and rupture area, and a comparison is made with other events in the same region: it is concluded that this earthquake does not exhibit an "intra-plate" behavior, but rather compares better with "inter-plate" events, such as the great Assam earthquake.

Original language	English (US)
Pages (from-to)	319-328
Number of pages	10
Journal	Physics of the Earth and Planetary Interiors
Volume	12
Issue number	4
DOIs	https://doi.org/10.1016/0031-9201(76)90027-3
State	Published - Sep 1976

ASJC Scopus subject areas

Astronomy and Astrophysics
Geophysics
Physics and Astronomy (miscellaneous)
Space and Planetary Science

Access to Document

10.1016/0031-9201(76)90027-3

Fingerprint Dive into the research topics of 'A surface-wave investigation of the rupture mechanism of the Gobi-Altai (December 4, 1957) earthquake'. Together they form a unique fingerprint.

Cite this

@article{abee3b56529348c4a6afb3163f12e793,

title = "A surface-wave investigation of the rupture mechanism of the Gobi-Altai (December 4, 1957) earthquake",

abstract = "Long-period records of multiple Love waves from the 1957 earthquake in Mongolia (MS = 8.0) at Pasadena are analysed and compared to synthetic seismograms, generated by the method of Kanamori. A fit in the time domain shows that the records are not consistent with the previous solution, achieved through a frequency-domain analysis of directivity by Ben-Menahem and Toks{\"o}z. The solution asks for a shorter rupture of 270 km at a velocity of 3.5 km/s. The focal parameters are constrained by updating all the reported first motion and are found to be: strike = 103°, dip = 53°, slip = 32°. A seismic moment of 1.8 · 1028 dyn · cm is obtained. These figures are also consistent with a time-domain analysis of Love waves at Palisades and Strasbourg, and of Rayleigh waves at Pasadena, with a directivity study of Love waves at Pasadena, and with static deformation and isoseismal data. A discussion is given of the relation between moment, magnitude and rupture area, and a comparison is made with other events in the same region: it is concluded that this earthquake does not exhibit an {"}intra-plate{"} behavior, but rather compares better with {"}inter-plate{"} events, such as the great Assam earthquake.",

author = "Okal, {Emile A.}",

year = "1976",

month = sep,

doi = "10.1016/0031-9201(76)90027-3",

language = "English (US)",

volume = "12",

pages = "319--328",

journal = "Physics of the Earth and Planetary Interiors",

issn = "0031-9201",

publisher = "Elsevier",

number = "4",

}

TY - JOUR

T1 - A surface-wave investigation of the rupture mechanism of the Gobi-Altai (December 4, 1957) earthquake

AU - Okal, Emile A.

PY - 1976/9

Y1 - 1976/9

N2 - Long-period records of multiple Love waves from the 1957 earthquake in Mongolia (MS = 8.0) at Pasadena are analysed and compared to synthetic seismograms, generated by the method of Kanamori. A fit in the time domain shows that the records are not consistent with the previous solution, achieved through a frequency-domain analysis of directivity by Ben-Menahem and Toksöz. The solution asks for a shorter rupture of 270 km at a velocity of 3.5 km/s. The focal parameters are constrained by updating all the reported first motion and are found to be: strike = 103°, dip = 53°, slip = 32°. A seismic moment of 1.8 · 1028 dyn · cm is obtained. These figures are also consistent with a time-domain analysis of Love waves at Palisades and Strasbourg, and of Rayleigh waves at Pasadena, with a directivity study of Love waves at Pasadena, and with static deformation and isoseismal data. A discussion is given of the relation between moment, magnitude and rupture area, and a comparison is made with other events in the same region: it is concluded that this earthquake does not exhibit an "intra-plate" behavior, but rather compares better with "inter-plate" events, such as the great Assam earthquake.

AB - Long-period records of multiple Love waves from the 1957 earthquake in Mongolia (MS = 8.0) at Pasadena are analysed and compared to synthetic seismograms, generated by the method of Kanamori. A fit in the time domain shows that the records are not consistent with the previous solution, achieved through a frequency-domain analysis of directivity by Ben-Menahem and Toksöz. The solution asks for a shorter rupture of 270 km at a velocity of 3.5 km/s. The focal parameters are constrained by updating all the reported first motion and are found to be: strike = 103°, dip = 53°, slip = 32°. A seismic moment of 1.8 · 1028 dyn · cm is obtained. These figures are also consistent with a time-domain analysis of Love waves at Palisades and Strasbourg, and of Rayleigh waves at Pasadena, with a directivity study of Love waves at Pasadena, and with static deformation and isoseismal data. A discussion is given of the relation between moment, magnitude and rupture area, and a comparison is made with other events in the same region: it is concluded that this earthquake does not exhibit an "intra-plate" behavior, but rather compares better with "inter-plate" events, such as the great Assam earthquake.

UR - http://www.scopus.com/inward/record.url?scp=0010632520&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0010632520&partnerID=8YFLogxK

U2 - 10.1016/0031-9201(76)90027-3

DO - 10.1016/0031-9201(76)90027-3

M3 - Article

AN - SCOPUS:0010632520

VL - 12

SP - 319

EP - 328

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

SN - 0031-9201

IS - 4

ER -