Rupture history of September 30, 1999 intraplate earthquake of Oaxaca, Mexico (M<i><sub>W</sub></i>=7.5) from inversion of strong‐motion data

Hernandez, B.; Shapiro, N. M.; Singh, S. K.; Pacheco, Jesús; Cotton, Fabrice; Campillo, Míchel; Iglesias, A.; Cruz, Vicentina; Gómez, Juan Manuel Portilla; Alcántara, L.

doi:10.1029/2000gl011975

Cited by 42 publications

(37 citation statements)

References 12 publications

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“…The slip distribution shows two branches aligned toward the south and east, and maximum slip of over 3 m occurs 10 km south of the hypocenter (Courboulex et al, 1997) and the 1999 Oaxaca earthquakes (Hernandez et al, 2001) are also displayed.…”

Section: The 1995 Guerrero Earthquakementioning

confidence: 99%

“…In this calculation the fault rupture is approximated by 630 double-couple point sources arranged on the fault plate with an interval of 2.7 km, and the rupture propagates almost unilaterally from the epicenter to the northwest with a rupture velocity of about 2.7-3.0 km/sec (Hernandez et al, 2001). Total moment for this earthquake is M 0 ‫ס‬ 1.7 ‫ן‬ 10 20 N m. The snapshot of the seismic-wave field from the deeper source of the 1999 Oaxaca earthquake shows simple characteristics as compared with that from the shallow, thrustfaulting 1995 Guerrero earthquake (Fig.…”

Section: The 1995 Guerrero Earthquakementioning

confidence: 99%

“…We used the fault rupture model of Hernandez et al (2001) derived from an inversion using near-source strongmotion records. The slip distribution on the fault shows two areas of 2.5-m peak slip located about 20 km and 40 km northwest of the hypocenter at a depth of about 45 km.…”

Section: The 1995 Guerrero Earthquakementioning

confidence: 99%

“…These events were well recorded by the Mexican broadband seismograph network and the strong-motion array, permitting detailed source studies of some of these events (e.g., Mikumo et al, 1999;Quintanar et al, 1999;Hernandez et al, 2001;Iglesias et al, 2002). The data were also used to derive empirical attenuation relations (Singh et al, 2000a;Garcia et al, 2001;Iglesias et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Regional Wave Propagation from Mexican Subduction Zone Earthquakes: The Attenuation Functions for Interplate and Inslab Events

Furumura¹,

Singh²

2002

Bulletin of the Seismological Society of America

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The seismic waves from subduction zone earthquakes are significantly affected by the presence of 3D variation in crust and upper-mantle structure around the source area. These heterogeneous structures also profoundly modify the character of seismic waves as they propagate from the source area to regional distances. This is illustrated by studying shallow, interplate earthquakes along the Mexican subduction zone, and deeper, inslab, normal-faulting earthquakes in the subducted Cocos plate beneath Mexican mainland. The strong-motion recordings of these earthquakes are used to evaluate the character of wave propagation along the path between the source region and Mexico City. We compare the wavefield from two large earthquakes of different source type. During the shallow (H ‫ס‬ 17 km), interplate, 1995 Guerrero earthquake (M w 7.3), the Lg phase is the most prominent feature at regional distances of about 150 to a few hundred kilometers from the source. The presence of a lateral velocity gradient in the crust, caused by the subduction of the Cocos plate, enhances the Lg-wave amplitude, which is then amplified further in the Mexican volcanic belt by amplification in the low-velocity volcanic rocks. Both effects lead to very large ground motions along the path from the coast to the Mexican inland, in the frequency band from 0.2 to 4 Hz. However, for the deeper (H ‫ס‬ 40 km), inslab, normal-faulting, 1999 Oaxaca earthquake (M w 7.5), the amplitude of the Lg phase is too small to produce the abnormal wave propagation, and the direct S wave and its multiple SmS reflections between the free-surface and Moho show a simple attenuation with increasing distance. We compare these observations with numerical simulations of seismic-wave propagation using the Fourier spectral method. The results provide a key to the understanding of seismic-wave field generated by shallow interplate and deeper inslab earthquakes in a realistic 3D heterogeneous structure.

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Section: The 1995 Guerrero Earthquakementioning

confidence: 99%

Section: The 1995 Guerrero Earthquakementioning

confidence: 99%

Section: The 1995 Guerrero Earthquakementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regional Wave Propagation from Mexican Subduction Zone Earthquakes: The Attenuation Functions for Interplate and Inslab Events

Furumura¹,

Singh²

2002

Bulletin of the Seismological Society of America

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“…This provides a larger dynamic range to study this phenomenon, especially by including tremor sequences detected in Japan that exhibit short durations and small seismic moments but fast propagation velocities. Source parameters published for earthquakes are also collected and used as a comparison with SSEs (Kanamori and Anderson, 1975;Geller, 1976;Heaton, 1990;Wald and Heaton, 1994;Wald et al, 1996;Kanamori et al, 1998;Yagi and Kikuchi, 2000;Hernandez et al, 2001;Hwang et al, 2001;Hanks and Bakun, 2002;Baumont et al, 2002;Ji et al, 2002;Yagi, 2004;Ishii et al, 2005;Hanks and Bakun, 2008).…”

Section: Slow Slip Data Setmentioning

confidence: 99%

Scaling Relationships of Source Parameters for Slow Slip Events

Gao

Schmidt

Weldon

2012

Bulletin of the Seismological Society of America

111

169

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To better understand the physical mechanisms of slow slip events (SSEs) detected worldwide, we explore the scaling relationships of various source parameters and compare them with similar scaling laws for earthquakes. These scaling relationships highlight differences and similarities between slow slip events and earthquakes and hold implications for the degree of heterogeneity and fault-healing characteristics. The static stress drop remains constant for different-sized events as is observed for earthquakes. However, the static stress drop of slow slip events is within a range of 0.01-1.0 MPa, 1-2 orders of magnitude lower than that found for earthquakes, which could be related to the low stress state on the fault. The average rupture velocity, ranging from kilometers per second to kilometers per day, decreases linearly with increasing seismic moment in log-log space, unlike earthquakes that are nearly constant. This inverse relationship of rupture velocity with seismic moment could be related to the heterogeneity of fault properties. Slow slip events typically have ratios of event duration over dislocation rise time less than 3, while earthquakes have ratios greater than 3. This indicates that slow slip events are less pulselike than earthquakes in their mode of propagation and suggests that the healing behind the rupture front is delayed. The recurrence statistics of slow slip events on the northern Cascadia subduction zone are weakly time predictable and moderately antislip predictable (that is, the event size and preevent recurrence interval are anticorrelated), which may indicate that healing between events strengthens the fault with time.

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A geodetic matched filter search for slow slip with application to the Mexico subduction zone

et al. 2017

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Since the discovery of slow slip events, many methods have been successfully applied to model obvious transient events in geodetic time series, such as the widely used network strain filter. Independent seismological observations of tremors or low‐frequency earthquakes and repeating earthquakes provide evidence of low‐amplitude slow deformation but do not always coincide with clear occurrences of transient signals in geodetic time series. Here we aim to extract the signal corresponding to slow slips hidden in the noise of GPS time series, without using information from independent data sets. We first build a library of synthetic slow slip event templates by assembling a source function with Green's functions for a discretized fault. We then correlate the templates with postprocessed GPS time series. Once the events have been detected in time, we estimate their duration T and magnitude Mw by modeling a weighted stack of GPS time series. An analysis of synthetic time series shows that this method is able to resolve the correct timing, location, T, and Mw of events larger than Mw 6 in the context of the Mexico subduction zone. Applied on a real data set of 29 GPS time series in the Guerrero area from 2005 to 2014, this technique allows us to detect 28 transient events from Mw 6.3 to 7.2 with durations that range from 3 to 39 days. These events have a dominant recurrence time of 40 days and are mainly located at the downdip edges of the Mw>7.5 slow slip events.

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Rupture history of September 30, 1999 intraplate earthquake of Oaxaca, Mexico (M_W=7.5) from inversion of strong‐motion data

Abstract: Abstract.Near-source strong motions are inverted to estimate the rupture history of intraslab, normalfaulting September 30, 1999, Oaxaca, Mexico earthquake. Two focal mechanisms (Harvard and NEIC CMT solutions) are tested for the source geometry.

Cited by 42 publications

References 12 publications

Regional Wave Propagation from Mexican Subduction Zone Earthquakes: The Attenuation Functions for Interplate and Inslab Events

Regional Wave Propagation from Mexican Subduction Zone Earthquakes: The Attenuation Functions for Interplate and Inslab Events

Scaling Relationships of Source Parameters for Slow Slip Events

A geodetic matched filter search for slow slip with application to the Mexico subduction zone

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Rupture history of September 30, 1999 intraplate earthquake of Oaxaca, Mexico (MW=7.5) from inversion of strong‐motion data

Abstract: Abstract.Near-source strong motions are inverted to estimate the rupture history of intraslab, normalfaulting September 30, 1999, Oaxaca, Mexico earthquake. Two focal mechanisms (Harvard and NEIC CMT solutions) are tested for the source geometry.

Cited by 42 publications

References 12 publications

Regional Wave Propagation from Mexican Subduction Zone Earthquakes: The Attenuation Functions for Interplate and Inslab Events

Regional Wave Propagation from Mexican Subduction Zone Earthquakes: The Attenuation Functions for Interplate and Inslab Events

Scaling Relationships of Source Parameters for Slow Slip Events

A geodetic matched filter search for slow slip with application to the Mexico subduction zone

Contact Info

Product

Resources

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Rupture history of September 30, 1999 intraplate earthquake of Oaxaca, Mexico (M_W=7.5) from inversion of strong‐motion data