Геология России: Recent submissions

Now showing items 1421-1440 of 43490

CRUSTAL STRUCTURE OF CHINA AND SURROUNDING REGIONS FROM P WAVE TRAVELTIME TOMOGRAPHY

Sun Y.; Toksöz M.N. (2006)

A three-dimensional (3-D) P wave velocity model is developed for the crust and uppermost mantle of China and the surrounding area by applying the tomography method of Zhao et al. using 500,000 high-quality P wave first ...
TIME-LAPSE MONITORING OF ROCK PROPERTIES WITH CODA WAVE INTERFEROMETRY

Grêt A.; Snieder R.; Scales J. (2006)

The coda of seismic waves consists of that part of the signal after the directly arriving phases. In a finite medium, or in one that is strongly heterogeneous, the coda is dominated by waves which have repeatedly sampled ...
MANTLE MELTING AS A FUNCTION OF WATER CONTENT BENEATH BACK-ARC BASINS

Kelley K.A.; Plank T.; Hauri E.; Grove T.L.; Stolper E.M.; Newman S. (2006)

Subduction zone magmas are characterized by high concentrations of H2O, presumably derived from the subducted plate and ultimately responsible for melting at this tectonic setting. Previous studies of the role of water ...
EVIDENCE FOR ASYMMETRIC NONVOLCANIC RIFTING AND SLOW INCIPIENT OCEANIC ACCRETION FROM SEISMIC REFLECTION DATA OF THE NEWFOUDLAND MARGIN

Shillington D.J.; Holbrook W.S.; Van Avendonk H.J.A.; Tucholke B.E.; Hopper J.R.; Louden K.E.; Larsen H.C.; Nunes G.T. (2006)

Prestack depth migrations of seismic reflection data collected around the Ocean Drilling Program (ODP) Leg 210 transect on the Newfoundland nonvolcanic margin delineate three domains: (1) extended continental crust, (2) ...
IMAGING THE TRANSITION FROM ALEUTIAN SUBDUCTION TO YAKUTAT COLLISION IN CENTRAL ALASKA, WITH LOCAL EARTHQUAKES AND ACTIVE SOURCE DATA

Eberhart-Phillips D.; Haeussler P.J.; Christensen D.H.; Hansen R.; Ruppert N.A.; Brocher T.M.; Abers G.A. (2006)

In southern and central Alaska the subduction and active volcanism of the Aleutian subduction zone give way to a broad plate boundary zone with mountain building and strike-slip faulting, where the Yakutat terrane joins ...
VOLCANO-EARTHQUAKE INTERACTION AT MAUNA LOA VOLCANO, HAWAII

Walter T.R.; Amelung F. (2006)

The activity at Mauna Loa volcano, Hawaii, is characterized by eruptive fissures that propagate into the Southwest Rift Zone (SWRZ) or into the Northeast Rift Zone (NERZ) and by large earthquakes at the basal decollement ...
UNUSUAL MANTLE POISSON'S RATIO, SUBDUCTION, AND CRUSTAL STRUCTURE IN CENTRAL ALASKA

Rossi G.; Abers G.A.; Rondenay S.; Christensen D.H. (2006)

Subduction zones alter the upper plate in a variety of ways, including metasomatism via slab-derived fluids and accretion of exotic terTanes. These processes should produce distinctive seismic signatures, as seismic ...
MIDMANTLE DEFORMATION BETWEEN THE AUSTRALIAN CONTINENT AND THE FIJI-TONGA SUBDUCTION ZONE?

Heintz M. (2006)

Shear wave splitting measurements are performed at temporary Stations deployed across the Australian continent for direct S waves from events occurring in the neighboring subduction zones, especially Fiji-Tonga. Unlike ...
SEASONAL AND INTERANNUAL GLOBAL SURFACE MASS VARIATIONS FROM MULTISATELLITE GEODETIC DATA

Wu X.; Heflin M.B.; Ivins E.R.; Fukumori I. (2006)

Monthly global surface mass distribution changes are estimated in the spherical harmonic domain with a complete spectrum up to degree and order 50. The estimates are derived by inverting GPS displacement series measured ...
HIGH-RESOLUTION MANTLE TOMOGRAPHY OF CHINA AND SURROUNDING REGIONS

Huang J.; Zhao D. (2006)

A high-resolution P wave tomographic model of the crust and mantle down to 1100 km depth under China and surrounding regions is determined by using about one million arrival times of P, pP, PP, and PcP waves from 19,361 ...
A THINNED LITHOSPHERIC IMAGE OF THE TANLU FAULT ZONE, EASTERN CHINA: CONSTRUCTED FROM WAVE EQUATION BASED RECEIVER FUNCTION MIGRATION

Chen L.; Zheng T.; Xu W. (2006)

We apply the newly proposed wave equation-based receiver function poststack migration method to the Northern China Interior Structure Project broadband data to image the lithospheric structure of the Tanlu Fault Zone area ...
INVESTIGATION OF UPPER MANTLE DISCONTINUITY STRUCTURE BENEATH THE CENTRAL PACIFIC USING SS PRECURSORS

Schmerr N.; Garnero E. (2006)

Using a high-quality broadband seismic data set of precursors to the phase SS, we investigate the structure of upper mantle discontinuities beneath the central Pacific, including the Hawaiian hot spot. We image structure ...
THE THERMAL STRUCTURE OF SUBDUCTION ZONE BACK ARCS

Currie C.A.; Hyndman R.D. (2006)

It is well recognized that active arc volcanism at nearly all subduction zones requires temperatures greater than 1200°C in the subarc mantle, despite the underthrusting cool subducting plate. In this study, we document ...
FLUID RELEASE FROM THE SUBDUCTED COCOS PLATE AND PARTIAL MELTING OF THE CRUST DEDUCED FROM MAGNETOTELLURIC STUDIES IN SOUTHERN MEXICO: IMPLICATIONS FOR THE GENERATION OF VOLCANISM AND SUBDUCTION DYNAMICS

Jödicke H.; Jording A.; Ferrari L.; Arzate J.; Mezger K.; Rüpke L. (2006)

In order to study electrical conductivity phenomena that are associated with subduction related fluid release and melt production, magnetotelluric (MT) measurements were carried out in southern Mexico along two coast to ...
TRANSMISSION TO REFLECTION TRANSFORMATION OF TELESEISMIC WAVEFIELDS

Kumar R.M.; Bostock M.G. (2006)

In this paper we review the transformation of P and SV transmission Green's functions into the corresponding reflection quantities for one-dimensional, elastic media at precritical slownesses. To obtain estimates of the ...
UPPER MANTLE SEISMIC STRUCTURE BENEATH EASTERN MEXICO DETERMINED FROM P AND S WAVEFORM INVERSION AND ITS IMPLICATIONS

Gao W.; Grand S.P.; Matzel E. (2006)

We present compressional (P) and shear (S) wave seismic velocity models for the upper mantle beneath southeastern Mexico derived from waveform inversion of triplicated seismic phases. The seismic waveform data produced by ...
HYDROTHERMAL ACTIVITY AND MAGMA GENESIS ALONG A PROPAGATING BACK-ARC BASIN: VALU FA RIDGE (SOUTHERN LAU BASIN)

Fretzdorff S.; Garbe-Schönberg C.-D.; Stoffers P.; Schwarz-Schampera U.; Gibson H.L.; Hauff F. (2006)

Valu Fa Ridge is an intraoceanic back-arc spreading center located at the southern prolongation of the Lau basin. Bathymetric observations as well as detailed sampling have been carried out along the spreading axis in order ...
INDIA AND SUNDA PLATES MOTION AND DEFORMATION ALONG THEIR BOUNDARY IN MYANMAR DETERMINED BY GPS

Socquet A.; Vigny C.; Chamot-Rooke N.; Simons W.; Ambrosius B.; Rangin C. (2006)

Using a regional GPS data set including ~190 stations in Asia, from Nepal to eastern Indonesia and spanning 11 years, we update the present-day relative motion between the Indian and Sundaland plates and discuss the ...
SUBDUCTION HISTORY OF THE TETHYAN REGION DERIVED FROM SEISMIC TOMOGRAPHY AND TECTONIC RECONSTRUCTIONS

Hafkenscheid E.; Wortel M.J.R.; Spakman W. (2006)

In the mantle underneath the Tethyan suture zone, large volumes of positive velocity anomalies have been imaged by seismic tomography and interpreted as the present-day signature of subducted. Tethyan lithosphere. We ...
SYNTHESIS OF VECTOR WAVE ENVELOPES IN THREE-DIMENSIONAL RANDOM ELASTIC MEDIA CHARACTERIZED BY A GAUSSIAN AUTOCORRELATION FUNCTION BASED ON THE MARKOV APPROXIMATION: PLANE WAVE CASE

Sato H. (2006)

High-frequency seismograms of microearthquakes observed at long travel distances have longer apparent durations than the source durations caused by scattering due to lithospheric inhomogeneity. Frequency dependence of the ...

Now showing items 1421-1440 of 43490

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