Recursos de colección

Caltech Authors (142.336 recursos)

Repository of works by Caltech published authors.

Group = Caltech Tectonics Observatory. MesoAmerican Subduction Experiment (MASE)

Mostrando recursos 1 - 4 de 4

  1. Nonvolcanic tremor observed in the Mexican subduction zone

    Payero, Juan S.; Kostoglodov, Vladimir; Shapiro, Nikolai; Mikumo, Takeshi; Iglesias, Arturo; Pérez-Campos, Xyoli; Clayton, Robert W.
    Nonvolcanic tremor (NVT) activity is revealed as episodes of higher spectral amplitude at 1–8 Hz in daily spectrograms from the continuous seismological records in Guerrero, Mexico. The analyzed data cover a period of 2001–2007 when in 2001–2002 a large slow slip event (SSE) had occurred in the Guerrero-Oaxaca region, and then a new large SSE occurred in 2006. The tremor burst is dominated by S-waves. More than 100 strong NVT bursts were recorded in the narrow band of ~40 × 150 km^2 to the south of Iguala City and parallel to the coastline. Depths of NVT hypocenters are mostly scattered...
    (application/pdf; text/plain; image/jpeg; image/jpeg; image/jpeg; image/jpeg; image/jpeg; image/jpeg; image/jpeg) - 01-feb-2017

  2. Seismic attenuation structure in central Mexico: Image of a focused high-attenuation zone in the mantle wedge

    Chen, Ting; Clayton, Robert W.
    Velocity spectra from moderate-sized earthquakes were used to investigate the P wave attenuation structure in central Mexico. In particular, we included regional events with magnitudes in the range of 4.5 to 6.1 recorded from 2005 to 2007 on the Middle American Subduction Experiment (MASE) array, which consists of 100 broadband sensors across central Mexico from Acapulco to Tempoal, near the Gulf of Mexico. By assuming a Brune-type source, a frequency-independent t* value was obtained for each seismogram in the frequency band 1 to 30 Hz. These measurements were then inverted for two-dimensional spatial variations in Q_p in the cross section...
    (application/pdf) - 01-feb-2017

  3. Subducting slab ultra-slow velocity layer coincident with silent earthquakes in southern Mexico

    Song, Teh-Ru Alex; Helmberger, Donald V.; Brudzinski, Michael R.; Clayton, Robert W.; Davis, Paul; Pérez-Campos, Xyoli; Singh, Shri K.
    Great earthquakes have repeatedly occurred on the plate interface in a few shallow-dipping subduction zones where the subducting and overriding plates are strongly locked. Silent earthquakes (or slow slip events) were recently discovered at the down-dip extension of the locked zone and interact with the earthquake cycle. Here, we show that locally observed converted SP arrivals and teleseismic underside reflections that sample the top of the subducting plate in southern Mexico reveal that the ultra-slow velocity layer (USL) varies spatially (3 to 5 kilometers, with an S-wave velocity of ~2.0 to 2.7 kilometers per second). Most slow slip patches coincide...
    (application/pdf; application/pdf) - 01-feb-2017

  4. Horizontal subduction and truncation of the Cocos Plate beneath central Mexico

    Pérez-Campos, Xyoli; Kim, YoungHee; Husker, Allen; Davis, Paul M.; Clayton, Robert W.; Iglesias, Arturo; Pacheco, Javier F.; Singh, Shri K.; Manea, Vlad Constantin; Gurnis, Michael
    Based on analysis of data from a trans-Mexico temporary broadband seismic network centered on Mexico City, we report that the subducting Cocos Plate beneath central Mexico is horizontal, and tectonically underplates the base of the crust for a distance of 250 km from the trench. It is decoupled from the crust by a very thin low viscosity zone. The plate plunges into the mantle near Mexico City but is truncated at a depth of 500 km, probably due to an E-W propagating tear in the Cocos slab. Unlike the shallow slab subduction in Peru and Chile, there is active volcanism...
    (application/pdf) - 01-feb-2017

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