P-Wave Velocity Tomography from Local Earthquakes in Western Mexico

Ochoa-Chávez, Juan A.; Escudero, C. R.; Núñez-Cornũ, F. J.; Bandy, William L.

doi:10.1007/978-3-319-51529-8_15

Cited by 3 publications

(3 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many authors have extensively analyzed these data, using different techniques. The travel times of body waves from regional seismicity were inverted by Ochoa‐Chávez et al () to derive the crustal structure beneath the entire Rivera region. Data from the same networks were used to perform teleseismic tomography inversion (Yang et al, ), providing information on the seismic structures down to the upper mantle.…”

Section: Introductionmentioning

confidence: 99%

Fault‐Associated Magma Conduits Beneath Volcán de Colima Revealed by Seismic Velocity and Attenuation Tomography Studies

et al. 2019

View full text Add to dashboard Cite

We present the results of tomographic studies using seismic velocity and attenuation in the area of the Colima Volcanic complex (CVC). Our dataset comprises body waves from local earthquakes recorded by the temporary seismic stations of the CODEX network in the Colima area and a few stations of the regional Mapping the Rivera Subduction Zone (MARS) networks, both deployed in 2006–2008. We obtain three‐dimensional distributions of seismic velocities and attenuation in the crust beneath the CVC area. At shallow depths, we observe a large negative anomaly to the south of CVC, coinciding with the location of the Central Colima Graben. This anomaly may represent debris avalanche deposits, as well as shallow magma reservoirs feeding the eruptions of the presently active Volcán de Colima. In contrast, the volcano edifice of Nevado de Colima, which is built of rigid igneous rocks, is associated with high‐velocity and low‐attenuation anomalies at shallow depths. In the deeper section, a major anomaly with high Vp/Vs, low Vs, and high S wave attenuation corresponds to the location of the regional Tamazula fault. As this represents a mechanically weakened zone of the crust, it may form the pathway that feeds CVC. Both velocity and attenuation models show that the fault‐associated conduit brought magma from the mantle through the lower crust to a depth of 15 km. Then, a light fraction of magma may continue to ascend, forming shallow reservoirs beneath the southern flank of CVC.

show abstract

Section: Introductionmentioning

confidence: 99%

Fault‐Associated Magma Conduits Beneath Volcán de Colima Revealed by Seismic Velocity and Attenuation Tomography Studies

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The gravity study of BANDY et al (1995) supported the proposal of BANDY (1992), however, it raised the possibility that the tear zone between the Rivera and Cocos plates beneath NA could extend to the area beneath the northern Colima rift (i.e., to the NE the boundary was a wide tear zone). The proposal of a wide tear zone between the subducted Rivera and Cocos plates beneath the northern Colima Graben and adjacent areas produced by divergence between the Rivera and Cocos plates is supported by the seismic studies of YANG et al (2009), LEON SOTO et al (2009) and OCHOA-CHAVEZ et al (2015. More recently, ALVAREZ and YUTSIS (2015) also place the boundary beneath the southern Colima rift.…”

Section: Geological Settingmentioning

confidence: 89%

Multichannel Seismic Imaging of the Rivera Plate Subduction at the Seismogenic Jalisco Block Area (Western Mexican Margin)

Bartolomé

Gorriz

Dañobeitia

et al. 2016

Pure Appl. Geophys.

Self Cite

View full text Add to dashboard Cite

Abstract-During the TSUJAL marine geophysical survey, conducted in February and March 2014, Spanish, Mexican and British scientists and technicians explored the western margin of Mexico, considered one of the most active seismic zones in America. This work aims to characterize the internal structure of the subduction zone of the Rivera plate beneath the North American plate in the offshore part of the Jalisco Block, to link the geodynamic and the recent tectonic deformation occurring there with the possible generation of tsunamis and earthquakes. For this purpose, it has been carried out acquisition, processing and geological interpretation of a multichannel seismic reflection profile running perpendicular to the margin. Crustal images show an oceanic domain, dominated by subduction-accretion along the lower slope of the margin with a subparallel sediment thickness of up to 1.6 s two-way travel time (approx. 2 km) in the Middle American Trench. Further, from these data the region appears to be prone to giant earthquake production. The top of the oceanic crust (intraplate reflector) is very well imaged. It is almost continuous along the profile with a gentle dip (\10°); however, it is disrupted by normal faulting resulting from the bending of the plate during subduction. The continental crust presents a well-developed accretionary prism consisting of highly deformed sediments with prominent slumping towards the trench that may be the result of past tsunamis. Also, a bottom simulating reflector (BSR) is identified in the first half a second (twtt) of the section. High amplitude reflections at around 7-8 s twtt clearly image a discontinuous Moho, defining a very gentle dipping subduction plane.

show abstract

“…The gravity study of BANDY et al (1995) supported the proposal of BANDY (1992), however, it raised the possibility that the tear zone between the Rivera and Cocos plates beneath NA could extend to the area beneath the northern Colima rift (i.e., to the NE the boundary was a wide tear zone). The proposal of a wide tear zone between the subducted Rivera and Cocos plates beneath the northern Colima Graben and adjacent areas produced by divergence between the Rivera and Cocos plates is supported by the seismic studies of YANG et al (2009), LEON SOTO et al (2009) and OCHOA-CHAVEZ et al (2015). More recently, ALVAREZ and YUTSIS (2015) also place the boundary beneath the southern Colima rift.…”

Section: Geological Settingmentioning

confidence: 92%

Multichannel Seismic Imaging of the Rivera Plate Subduction at the Seismogenic Jalisco Block Area (Western Mexican Margin)

Bartolomé¹,

Gorriz²,

Dañobeitia³

et al. 2016

Pageoph Topical Volumes

Self Cite

View full text Add to dashboard Cite

During the TSUJAL marine geophysical survey, conducted in February and March 2014, Spanish, Mexican and British scientists and technicians explored the western margin of Mexico, considered one of the most active seismic zones in America. This work aims to characterize the internal structure of the subduction zone of the Rivera plate beneath the North American plate in the offshore part of the Jalisco Block, to link the geodynamic and the recent tectonic deformation occurring there with the possible generation of tsunamis and earthquakes. For this purpose, it has been carried out acquisition, processing and geological interpretation of a multichannel seismic reflection profile running perpendicular to the margin. Crustal images show an oceanic domain, dominated by subduction-accretion along the lower slope of the margin with a subparallel sediment thickness of up to 1.6 s two-way travel time (approx. 2 km) in the Middle American Trench. Further, from these data the region appears to be prone to giant earthquake production. The top of the oceanic crust (intraplate reflector) is very well imaged. It is almost continuous along the profile with a gentle dip (\10°); however, it is disrupted by normal faulting resulting from the bending of the plate during subduction. The continental crust presents a well-developed accretionary prism consisting of highly deformed sediments with prominent slumping towards the trench that may be the result of past tsunamis. Also, a bottom simulating reflector (BSR) is identified in the first half a second (twtt) of the section. High amplitude reflections at around 7-8 s twtt clearly image a discontinuous Moho, defining a very gentle dipping subduction plane.

show abstract

P-Wave Velocity Tomography from Local Earthquakes in Western Mexico

Cited by 3 publications

References 96 publications

Fault‐Associated Magma Conduits Beneath Volcán de Colima Revealed by Seismic Velocity and Attenuation Tomography Studies

Fault‐Associated Magma Conduits Beneath Volcán de Colima Revealed by Seismic Velocity and Attenuation Tomography Studies

Multichannel Seismic Imaging of the Rivera Plate Subduction at the Seismogenic Jalisco Block Area (Western Mexican Margin)

Multichannel Seismic Imaging of the Rivera Plate Subduction at the Seismogenic Jalisco Block Area (Western Mexican Margin)

Contact Info

Product

Resources

About