Velocity Structure of the Tibetan Lithosphere: Constraints from P-Wave Travel Times of Regional Earthquakes

Griffin, Jessica D.; Nowack, Robert L.; Chen, Wang‐Ping; Tseng, Tai‐Lin

doi:10.1785/0120100229

Cited by 16 publications

(16 citation statements)

References 43 publications

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“…Here our result is in agreement with a nearby study by Griffin et al . [], and with results reviewed in Zhang et al . [].…”

Section: Discussionmentioning

confidence: 51%

“…Seismological studies of the crustal structure in the vicinity of western Tibet include a number of refraction lines [Zhang et al, 2011], receiver functions studies based on a Sino-French data set [Wittlinger et al, 2004], more recent investigations associated with the Hi-Climb project [Basuyau et al, 2013;Griffin et al, 2011;Nabelek et al, 2009], and analyses of dispersion of both ambient noise and ballistic surface waves [Rapine et al, 2003;Caldwell et al, 2009;Sun et al, 2010].…”

Section: Previous Studies In Western Tibetmentioning

confidence: 99%

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Crustal and uppermost mantle structure beneath western Tibet using seismic traveltime tomography

Razi

Levin

Roecker

et al. 2014

Geochem Geophys Geosyst

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We study the elastic wave speed structure of the crust and the uppermost mantle in western Tibet using P wave and S wave arrival times from regional earthquakes recorded by a temporary seismic network. We relocate the earthquakes, and subsequently invert travel time residuals for 3-D distributions of wave speed. Resolution tests with a variety of input structures are used to verify the reliability of our results. The crust beneath western Tibet has low P wave speed (5.9-6.3 km/s) throughout its nearly 80 km thickness, with lower values in this range concentrated within the Lhasa block. Beneath the Himalaya wave speeds are higher. Southern and western limits of the slow material beneath the Tibetan Plateau correlate with the Karakoram fault, and dip beneath the plateau at 40 angle. We find no evidence of a subhorizontal low velocity zone in the crust. In the uppermost mantle, we find a long and narrow region of fast (up to 8.4 km/s) P wave speed extending from the Karakoram fault in NE direction, and crossing the Bangong-Nujiang suture. In a north-south cross section, the distribution of relatively fast P wave speed suggests a ramp-flat geometry consistent with India underthrusting the Tibetan Plateau at least as far as 32.5 N. A plausible interpretation of the upper mantle fast feature is the formation of eclogite from the mafic lower-crustal material of India after it is underthrust beneath Tibet. Notably, in western Tibet this process only takes place in a narrow region.

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“…Here our result is in agreement with a nearby study by Griffin et al . [], and with results reviewed in Zhang et al . [].…”

Section: Discussionmentioning

confidence: 51%

Section: Previous Studies In Western Tibetmentioning

confidence: 99%

Crustal and uppermost mantle structure beneath western Tibet using seismic traveltime tomography

Razi

Levin

Roecker

et al. 2014

Geochem Geophys Geosyst

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“…For imaging the P‐wave reflectivity at the correct points in space we use a background velocity model based on a regional‐scale tomography [ Griffin et al , 2011]. From the average station elevation (5 km) to the maximum Moho depth (75 km) we use a linear velocity gradient from 5.5 to 6.5 km/s.…”

Section: Processingmentioning

confidence: 99%

“…This was a large and well‐sampled seismic array, passing the Himalayas and a significant part of the Tibetan Plateau. For this array, images have been published, which were obtained by applying a wide suite of different geophysical techniques [ Chen et al , 2010; Griffin et al , 2011; Hung et al , 2011; Nábelek et al , 2009; Nowack et al , 2010; Tseng et al , 2009; Xu et al , 2011]. This enables benchmarking of the GloPSI results.…”

Section: Introductionmentioning

confidence: 99%

Global‐phase seismic interferometry unveils P‐wave reflectivity below the Himalayas and Tibet

Ruigrok¹,

Wapenaar²

2012

Geophysical Research Letters

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[1] A number of seismic methods exist to image the lithosphere below a collection of receivers, using distant earthquakes. In the current practice, especially mode-conversions in teleseismic phases are utilized. We present a new method that takes advantage of the availability of global phases. This method is called global-phase seismic interferometry (GloPSI). With GloPSI, zero-offset reflections are extracted from reverberations near the array caused by global seismicity. We exemplify GloPSI with data from the Hi-CLIMB experiment (2002)(2003)(2004)(2005) and migrate the obtained reflection responses. This results in a 800 km long reflectivity profile through the Himalayas and a large part of the Tibetan Plateau.Citation: Ruigrok, E., and K. Wapenaar (2012), Global-phase seismic interferometry unveils P-wave reflectivity below the

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“…The NEIC and ISC locations are about 13 km and over 30 km, respectively, south-southwest of our location. Manual locations with Hi-CLIMB data (ours and Griffin et al 2011) are within a few km of the automated location. Moment tensor analysis reveals a well-constrained double-couple strike-slip mechanism at 4 km depth with an E-W trending  3 -axis.…”

Section: Ground Truth Eventsmentioning

confidence: 99%

Source and Path Calibration in Regions of Poor Crustal Propagation Using Temporary, Large-Aperture, High-Resolution Seismic Arrays (Postprint). Annual Report 3

Nábělek¹,

Braunmiller²,

Monigle³

et al. 2012

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Velocity Structure of the Tibetan Lithosphere: Constraints from P-Wave Travel Times of Regional Earthquakes

Cited by 16 publications

References 43 publications

Crustal and uppermost mantle structure beneath western Tibet using seismic traveltime tomography

Crustal and uppermost mantle structure beneath western Tibet using seismic traveltime tomography

Global‐phase seismic interferometry unveils P‐wave reflectivity below the Himalayas and Tibet

Source and Path Calibration in Regions of Poor Crustal Propagation Using Temporary, Large-Aperture, High-Resolution Seismic Arrays (Postprint). Annual Report 3

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