S. L. Klemperer
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View article: The Indian Plate subducting below the Tibet Plateau is tearing apart
The Indian Plate subducting below the Tibet Plateau is tearing apart Open
The first-order configuration of the Himalayan orogen is defined by northward motion of the Indian plate, whether directly underplating Tibetan crust or subducting beneath a mantle wedge. Here we used 3D S-wave receiver-functions from 462 …
View article: Migration of Seismicity from the Mantle to the Upper Crust Beneath Harrat Lunayyir Volcanic Field, Saudi Arabia
Migration of Seismicity from the Mantle to the Upper Crust Beneath Harrat Lunayyir Volcanic Field, Saudi Arabia Open
Harrat Lunayyir is a volcanic field in Saudi Arabia that experienced a Mw~5.4 earthquake driven by an upper-crustal dike intrusion in May 2009. This volcanic field has exhibited numerous forms of volcanic seismicity both prior to and since…
View article: Identification of Continental Mantle Earthquakes Using Regional Waves Propagating Into a Thinned Continental Crust
Identification of Continental Mantle Earthquakes Using Regional Waves Propagating Into a Thinned Continental Crust Open
We evaluate three identifiers of continental mantle earthquakes (CMEs) motivated by surface‐wave normal‐mode theory: the amplitude ratio of Sn to Lg , and the frequency content of Sn and of Lg , after wave propagation through continental c…
View article: Himalayan sub-Moho earthquakes suggest crustal faults trigger eclogitized-drip tectonics
Himalayan sub-Moho earthquakes suggest crustal faults trigger eclogitized-drip tectonics Open
Along the 1400-km Himalayan arc, 100 + sub-Moho earthquakes have been detected from their Sn/Lg amplitude ratios or S-P delay times, concentrated densely beneath a ~ 300-km segment in south Tibet where they reach ~ 110-km depth. Explanatio…
View article: Identification of continental mantle earthquakes using regional waves propagating into a thinned continental crust
Identification of continental mantle earthquakes using regional waves propagating into a thinned continental crust Open
We evaluate three identifiers of continental mantle earthquakes motivated by surface-wave normal-mode theory, the amplitude ratio of Sn to Lg, and the frequency content of Sn and of Lg, after wave propagation through continental crustal th…
View article: Numerical and observational study of Sn-to-Lg conversion due to crustal-thickening: implications for identification of continental mantle earthquakes
Numerical and observational study of Sn-to-Lg conversion due to crustal-thickening: implications for identification of continental mantle earthquakes Open
We study Sn-to-Lg conversion at regional distances due to significant crustal thickening, particularly in the context of using Sn and Lg amplitude ratios (Sn/Lg) to identify continental mantle earthquakes. We further enhance recent develop…
View article: Numerical and observational study of Sn-to-Lg conversion due to crustal-thickening: implications for identification of continental mantle earthquakes
Numerical and observational study of Sn-to-Lg conversion due to crustal-thickening: implications for identification of continental mantle earthquakes Open
We study Sn-to-Lg conversion at regional distances due to significant crustal thickening, particularly in the context of using Sn and Lg amplitude ratios (Sn/Lg) to identify continental mantle earthquakes. We further enhance recent develop…
View article: Slab tearing and delamination of the Indian lithospheric mantle during flat-slab subduction, southeast Tibet
Slab tearing and delamination of the Indian lithospheric mantle during flat-slab subduction, southeast Tibet Open
The first-order configuration of the Himalayan orogen is defined by the northward motion of the Indian Plate, whether directly "underplating" under the Tibetan crust or "subducting" beneath a mantle wedge. Our 3D S-wave receiver-functions …
View article: Strong Variability in the Thermal Structure of Tibetan Lithosphere
Strong Variability in the Thermal Structure of Tibetan Lithosphere Open
We present a model of thermal lithospheric thickness (the depth where the geotherm reaches a temperature of 1300°C) and surface heat flow in Tibet and adjacent regions based on a new thermal‐isostasy method. The method accounts for crustal…
View article: Strong variability in the thermal structure of Tibetan Lithosphere
Strong variability in the thermal structure of Tibetan Lithosphere Open
We present a model of thermal lithospheric thickness (the depth where the geotherm reaches a temperature of 1300°C) and surface heat flow in Tibet and adjacent regions based on the new thermal-isostasy method. The method accounts for …
View article: Thickness of the Saudi Arabian crust
Thickness of the Saudi Arabian crust Open
First posted December 29, 2023 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 As part of a joint Saudi Geological Survey (SGS) and U.S. Geologi…
View article: Crustal thickness and the VP/VS ratio within the Arabia Plate from P-wave receiver functions at 154 broadband seismic stations
Crustal thickness and the VP/VS ratio within the Arabia Plate from P-wave receiver functions at 154 broadband seismic stations Open
First posted September 21, 2023 For additional information, contact: Earthquake Science CenterU.S. Geological Survey350 N. Akron Rd.Moffett Field, CA 94035 As part of a joint Saudi Geological Survey (SGS) and United States Geological Surve…
View article: Numerical Simulation of Electromagnetic Responses to A Seismic Source Due to the Piezoelectric Effect
Numerical Simulation of Electromagnetic Responses to A Seismic Source Due to the Piezoelectric Effect Open
Earthquakes are frequently accompanied by electromagnetic (EM) anomalies. These anomalies are thought to be caused by earthquakes but the generation mechanism is still unclear. The piezoelectric effect has been proposed as a possible mecha…
View article: Regional variability in the thermal structure of Tibetan Lithosphere
Regional variability in the thermal structure of Tibetan Lithosphere Open
<p>We present a thermal model- of lithospheric thickness and surface heat flow in Tibet and adjacent regions (74-110<sup>o</sup> E, 26-42<sup>o</sup> N) based on topography and seismic Moho. We interpret stron…
View article: Limited underthrusting of India below Tibet: <sup>3</sup> He/ <sup>4</sup> He analysis of thermal springs locates the mantle suture in continental collision
Limited underthrusting of India below Tibet: <sup>3</sup> He/ <sup>4</sup> He analysis of thermal springs locates the mantle suture in continental collision Open
Significance Our regional-scale geochemical dataset ( 3 He/ 4 He) resolves the geometry of the continental collision between India and Asia. Geophysical images have led to contradictory interpretations that India directly underthrusts Tibe…
View article: Cratonic Earthquakes in the Crust-Mantle Transition, Western Canada
Cratonic Earthquakes in the Crust-Mantle Transition, Western Canada Open
Deep earthquakes in the lower continental lithosphere - the lower crust and uppermost mantle - are frequently too poorly located in depth to be definitively labelled as having occurred above or below the Mohorovičić discontinuity (Moho; ba…
View article: Tomographic Image of Shear Wave Structure of NE India Based on Analysis of Rayleigh Wave Data
Tomographic Image of Shear Wave Structure of NE India Based on Analysis of Rayleigh Wave Data Open
The major scientific purpose of this work is to evaluate the geodynamic processes involved in the development of tectonic features of NE India and its surroundings. In this work, we have obtained tomographic images of the crust and uppermo…
View article: Assessment of a claimed ultra-low frequency electromagnetic (ULFEM) earthquake precursor
Assessment of a claimed ultra-low frequency electromagnetic (ULFEM) earthquake precursor Open
Anomalous ultra-low frequency electromagnetic (ULFEM) pulses occurring before the M5.4 2007 and M4.0 2010 Alum Rock earthquakes have been claimed to increase in number days to weeks prior to each earthquake. We re-examine the previously re…
View article: Assessment of a claimed ultra-low frequency electromagnetic (ULFEM) earthquake precursor
Assessment of a claimed ultra-low frequency electromagnetic (ULFEM) earthquake precursor Open
SUMMARY The rate of occurrence of anomalous ultra-low frequency electromagnetic (ULFEM) pulses has been claimed to have increased days to weeks prior to the M5.4 2007 and M4.0 2010 Alum Rock earthquakes. We re-examine the previously report…
View article: Western Gondwana imaged by S receiver-functions (SRF): new results on Moho, MLD (mid-lithospheric discontinuity) and LAB (lithosphere-asthenosphere boundary)
Western Gondwana imaged by S receiver-functions (SRF): new results on Moho, MLD (mid-lithospheric discontinuity) and LAB (lithosphere-asthenosphere boundary) Open
We study the Moho, the mid-lithospheric discontinuity (MLD), and the lithosphere-asthenosphere boundary (LAB) from southern Africa to northern Arabia, from Archean cratons to active rifts, at 1° resolution using our comprehensive new datab…
View article: Above or Below the Moho? Contentious Earthquakes in the Southern East African Rift
Above or Below the Moho? Contentious Earthquakes in the Southern East African Rift Open
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]Above or Below the Moho? Contentious Earthquakes in the Southern East African RiftAuthorsKimberlyEspinaliDShiqi (Axel)WangBrianCheniDSi…
View article: Above or Below the Moho? Depth analysis of continental U.S. earthquakes using Sn/Lg ratio
Above or Below the Moho? Depth analysis of continental U.S. earthquakes using Sn/Lg ratio Open
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]Above or Below the Moho? Depth analysis of continental U.S. earthquakes using Sn/Lg ratioAuthorsBrianCheniDShiqi (Axel)WangKimberlyEspi…
View article: Mantle earthquakes in recently thinned Neoproterozoic lithosphere: Harrat Lunayyir, Saudi Arabia
Mantle earthquakes in recently thinned Neoproterozoic lithosphere: Harrat Lunayyir, Saudi Arabia Open
We use earthquake geothermometry, measured heat flow, and structural constraints from P-wave receiver functions to model the thermal evolution of the lithosphere beneath Harrat Lunayyir. We suggest that the lithosphere thinned to its prese…
View article: Thickness of the Saudi Arabian Crust
Thickness of the Saudi Arabian Crust Open
We analyzed P-wave receiver functions from seismic stations covering most of Saudi Arabia to map the thickness of the crust across the Arabian plate. We present an update of crustal-thickness estimates and fill in data gaps for the western…