Gravity and seismicity over the Guerrero Seismic Gap, Mexico

Kostoglodov, V.; Bandy, William L.; Domı́nguez, Jaime; Mena, M.

doi:10.1029/96gl03159

Cited by 53 publications

(78 citation statements)

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“…The plate interface geometry is adopted from Kostoglodov et al, 1996. The model fits fairly well the observed interevent displacement rates when the plate interface has a major coupling ratio 1 , κ = 0.8-0.9, on the 35 km wide seismogenic zone, which starts at ∼55 km from the trench.…”

Section: Elastic Dislocation Modelsmentioning

confidence: 83%

“…The magnetic anomalies are MAGSAT data reduced to the pole (RP) (Hinze et al, 1982). The configuration of the slab used in the present modeling is similar to the gravity models of Guerrero ob- tained by Kostoglodov et al (1996). For the sake of consistency we used the same densities: 3295 kg/m 3 for the upper mantle, 2700 and 2900 kg/m 3 for the upper part of the oceanic plate (basalt and gabbro), 3340 kg/m 3 for the oceanic lithosphere, 2670 kg/m 3 for the continental upper crust, and 3050 kg/m 3 for the continental lower crust.…”

Section: Configuration Of the Plate Interfacementioning

confidence: 96%

“…The age of the Cocos plate in the Guerrero-Oaxaca segment of the MAT is less than 16 Ma (Kostoglodov and Bandy, 1995). The plate interface is sub-horizontal in Guerrero (Kostoglodov et al, 1996) and Central Oaxaca (TorresZamudio, 2002), and gradually steepens toward southeastern Oaxaca (Pardo and Suarez, 1995;Bravo et al, 2004). An important factor which may influence seismic activity, crustal deformation and interplate coupling is the subduction of ocean floor bathymetric irregularities like subduction of the Tehuantepec ridge below the North American plate in the southeastern Oaxaca area, where a low degree of plate coupling would explain the relative deficiency of large earthquakes in the area (Fig.…”

Section: Seismotectonic Settingmentioning

confidence: 99%

“…Double head arrow shows the extent of the Guerrero seismic gap. Solid and dashed curves annotated with negative numbers show the depth in km down to the surface of subducting Cocos plate (modified from Pardo and Suárez, 1995, using the plate interface configuration model for the Central Oaxaca from this study, the model for Guerrero from Kostoglodov et al (1996), and the last seismological estimates in Chiapas by Bravo et al (2004). MAT, Middle America trench.…”

Section: Introductionmentioning

confidence: 99%

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Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

et al. 2005

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The aseismic slow slip event of [2001][2002] in Guerrero, Mexico, with an equivalent magnitude M W ∼ 7.5, is the largest silent earthquake (SQ) among many recently recorded by GPS in different subduction zones (i.e. Japan, Alaska, Cascadia, New Zealand). The sub-horizontal and shallow plate interface in Central Mexico is responsible for specific conditions for the ∼100 km long extended transient zone where the SQs develop from ∼80 to ∼190 km inland from the trench. This wide transient zone and relatively large slow slips of 10 to 20 cm displacements on the subduction fault result in noticeable surface displacements of 5-6 cm during the SQs. Continuous GPS stations allow one to trace the propagation of SQs, and to estimate their arrival time, duration and geometric attenuation. These propagation parameters must be accounted in order to locate source of slow slips events and to understand the triggering effect that they have on large subduction earthquakes. We use longbaseline tiltmeter data to define new time limits This modeling shows that the SQ ceased gradually in the central part of the Oaxaca segment of the subduction zone (west of Puerto Angel, PUAN) and then it apparently triggered another SQ in SE Oaxaca (between PUAN and Salina Cruz, SACR). The estimated horizontal velocities for inter-event epochs at each GPS site are used to assess an average interplate coupling in the Central Oaxaca subduction zone.

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Section: Elastic Dislocation Modelsmentioning

confidence: 83%

Section: Configuration Of the Plate Interfacementioning

confidence: 96%

Section: Seismotectonic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

et al. 2005

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“…In Guerrero, the location and geometry of the subduction megoe athrust is known from local seismicity and gravity modeling [Kostoglodov et al, 1996] (Figure 4). We model the deforma- The solution space has several error minima, but only two fall within 95% confidence of the global minimum.…”

Section: Deformation Modelingmentioning

confidence: 99%

Transient fault slip in Guerrero, southern Mexico

Lowry¹,

Larson²,

Kostoglodov³

et al. 2001

Geophysical Research Letters

197

191

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Abstract. The Guerrero region of southern Mexico has accumulated more than 5 m of relative plate motion since the last major earthquake. In early 1998, a continuous GPS site in Guerrero recorded a transient displacement. Modeling indicates that anomalous fault slip propagated from east to west along-strike of the subduction megathrust. Campaign GPS and leveling data corroborate the model. The moment release was equivalent to an M•o_>6.5 earthquake. No M>5 earthquakes accompanied the event, indicating the frictional regime is velocity-strengthening at the location of slip.

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Reassessing the 2006 Guerrero slow‐slip event, Mexico: Implications for large earthquakes in the Guerrero Gap

2015

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In Guerrero, Mexico, slow‐slip events have been observed in a seismic gap, where no earthquakes have occurred since 1911. A rupture of the entire gap today could result in a Mw 8.2–8.4 earthquake. However, it remains unclear how slow‐slip events change the stress field in the Guerrero seismic region and what their implications are for devastating earthquakes. Most earlier studies have relied on a sparse network of Global Navigation Satellite Systems measurements. Here we show that interferometric synthetic aperture radar can be used to improve the spatial resolution. We find that slip due to the 2006 slow‐slip event enters the seismogenic zone and the Guerrero Gap, with ∼5 cm slip reaching depths as shallow as 12 km. We show that slow slip is correlated with a highly coupled region and estimate that slow‐slip events have decreased the total accumulated moment since the end of the 2001/2002 slow‐slip event (4.7 years) by ∼50%. Nevertheless, even accounting for slow slip, the moment deficit in the Guerrero Gap increases each year by Mw∼6.8. The Guerrero Gap therefore still has the potential for a large earthquake, with a slip deficit equivalent to Mw∼8.15 accumulated over the last century. Correlation between the slow‐slip region and nonvolcanic tremor, and between slow slip and an ultraslow velocity layer, supports the hypothesis of a common source potentially related to high pore pressures.

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Gravity and seismicity over the Guerrero Seismic Gap, Mexico

Cited by 53 publications

References 10 publications

Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

Transient fault slip in Guerrero, southern Mexico

Reassessing the 2006 Guerrero slow‐slip event, Mexico: Implications for large earthquakes in the Guerrero Gap

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