2 edition of Seismic constraints on shallow crustal processes at the East Pacific Rise found in the catalog.
Seismic constraints on shallow crustal processes at the East Pacific Rise
Gail L. Christeson
|Statement||by Gail L. Christeson.|
|Series||WHOI -- 94-02., WHOI (Series) -- 94-02.|
|Contributions||Woods Hole Oceanographic Institution.|
|The Physical Object|
|Pagination||182 p. :|
|Number of Pages||182|
Seismic structure of the southern East pacific rise. Detrick RS, Harding AJ, Kent GM, Orcutt JA, Mutter JC, Buhl P. Seismic data from the ultrafast-spreading ( to millimeters per year) southern East Pacific Rise show that the rise axis is underlain by a thin (less than meters thick) extrusive volcanic layer (seismic layer 2A) that Cited by: Outer-rise Seismology: Crustal Structure and Seismic Activity of the Incoming Pacific Plate in the Trench-Outer Rise Region. Koichiro OBANA 1), Distribution and focal mechanisms of shallow seismicity within the oceanic crust indicate that seismicity is affected by the pre-existing structure, which probably formed at the mid-ocean ridges.
In Figure 2, log(Nb/Y) versus Zr, two data sets for the East Pacific Rise are considered, one combining three provinces for which high-precision ICP-MS data are available, the other all data, however measured, for samples from the well-studied segment of the East Pacific Rise between the Siqueiros and Clipperton transform faults (∼°– The mode of recent crustal deformation, including seismic one, of Shikoku has been revealed with precise levellings, as shown in Figs. In the southern part of Shikoku runs a hinge line of the recent crustal deformation, which was subsided at the seismic time and upheaved in the inter-seismic by: 6.
PROBABILISTIC SEISMIC HAZARD ASSESSMENT FOR ROMANIA CONSIDERING INTERMEDIATE-DEPTH (VRANCEA) AND SHALLOW (CRUSTAL) SEISMICITY Vladimir Sokolov 1, Friedemann Wenzel, Rakesh Mohindra 2, Bogdan Grecu 3, and Mircea Radulian 3 ABSTRACT The earthquake risk on Romania is one of the highest in Europe, and seismic File Size: 7MB. fault scarps cutting the shallow layers of late Pleisto-cene and Holocene sediments, giving us targets for paleoseismic studies. To obtain subsurface images of potential faults, and to provide constraints on computer modeling of earthquakes, U.S. Geological Survey and university scientists undertook the series of Seismic Hazard In-.
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Crustal earthquakes can and do occur throughout the Pacific Northwest though they occur more frequently where the crust is deforming the fastest. The Puget Sound Region has the highest risk for large crustal earthquakes though evidence has been found for large earthquakes in eastern Washington near Wenatchee, Yakima and further east, near Richland.
The seismic structure of the crust and shallow mantle beneath the East Pacific Rise near 9°3O′N is imaged by inverting P wave travel time data. Our tomographic results constrain for the first time the three‐dimensional structure of the lower crust in this region and allow us to compare it to shallow crustal and mantle by: Seismic heterogeneity in the upper crust near the eruption site on the East Pacific Rise, 9°50′N Seismic constraints on shallow crustal emplacement processes at the.
Fine-scale seismic structure of the shallow volcanic crust on the East Pacific Rise at 9 N Robert A. Sohn Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA Spahr C. Webb Lamont-Doherty Earth Observatory, Palisades, New York, USA John A.
Hildebrand. EISEVIER Earth and Planetary Science Letters () EPSL Constraining crustal emplacement processes from the variation in seismic layer 2A thickness at the East Pacific Rise Emilie E.E. Hooft a,*, Hans Schouten b, Robert S. Detrick b a Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography, Woods Cited by: The present‐day crustal configuration of the margin is then interpreted by modeling the effects of two end‐member classes of extension processes, pure shear and simple shear.
The applicability of each of these processes to the extension of the south China margin has been evaluated by comparing model predictions of subsidence and heat flow. Advances in seismic imaging of the shallow ve-locity structure at the East Pacific Rise allow the thickness of what is commonly interpreted as the extrusive layer to be directly mapped.
In this paper, we use the variation in this seismically determined extrusive thickness to provide new constraints on crustal emplacement processes. We show that the.  We use a combination of body wave and interface wave observations from an on‐bottom seismic refraction survey to constrain the fine‐scale seismic structure of the upper crust in a ∼3 × 3 km field area centered on the East Pacific Rise at 9°50′N.
We detonated 18 explosive shots (18 sources) in a circular pattern ( km radius) on the rise axis and recorded seismic arrivals with Cited by: The seismic structure of the crust and shallow mantle beneath the East Pacific Rise near 9°30'N is imaged by inverting P wave travel time data.
Seismic velocity constraints on the material properties that control earthquake behavior at the Quebrada‐Discovery‐Gofar transform faults, East Pacific Rise the observation that large East Pacific Rise The difference in shallow crustal structure across G3 may thus be evidence for a contrast in emplacement processes at the short.
The seismic anisotropy of the shallow oceanic crust across the East Pacific Rise (9°30′N) is studied with P-wave refraction data collected during a controlled-source, three-dimensional tomography experiment. The anisotropy is indicated by a cos(2θ) pattern of travel time residuals, where θ is the receiver to shot azimuth.
The travel time Cited by: A reflection observed on multi-channel seismic profiles along and across the East Pacific Rise between 8°50′ N and 13°30′ N is interpreted to arise from the top of a Cited by: I employ seismic waves to image the structure of the Earth's crust and mantle in order to better understand dynamic processes inside the Earth.
Our recent work has focused on two topics: the continental lithosphere and its interactions with the deeper mantle, and mantle flow and melting processes in subduction zones. Strength constraints of shallow crustal strata from analyses of mining induced seismicity M.
Alber 1, R. Fritschen 2, and M. Bischo 1,* 1 Engineering Geology, Ruhr-University Bochum, Germany 2 DMT GmbH & Co KG, Essen, Germany *now at: BGR, Hannover, Germany Received: 26 March Accepted: 23 April Published: 3 June Three-dimensional seismic structure and physical properties of the crust and shallow mantle beneath the East Pacific Rise at 9° 30′ N.
Geophys. Res. Schouten, H., and Denham, C. R.,Comparison of volcanic construction in the Troodos ophiolite and oceanic crust using paleomagnetic inclinations from Cyprus Crustal Study Project (CCSP) CY-1 and CY-1A and Ocean Drilling Program (ODP) B drill cores, in: Ophiolites and Oceanic Crust: New Insights from Field Studies and the Ocean Drilling Program,Volume Cited by: Seismic structure across the rift valley of the Mid-Atlantic ridge at 23°20′N (MARK area): implications for crustal accretion processes at slow-spreading ridges.
T., Multi-channel seismic imaging of a crustal magma chamber along the East Pacific Rise. of the crust and shallow mantle beneath the East Pacific Rise at 9°30′N. contrasting segments of the East Pacific Rise 15ø30'øN are used to assess the relationship between crustal structure, morphological indicators of magma supply, and ridge segmentation.
From stacked and migrated seismic profiles we evaluate the width and depth of the axial magma. The crustal magma chamber of the Katla volcano in south Iceland revealed by 2-D seismic undershooting O. Gudmundsson. the role of shallow crustal magma chambers in accommodating rising magma and their influence on remelting and recycling of the crust: Case histories from Askja Multichannel seismic imaging of a crustal magma chamber Cited by: aged shallow crustal structure within a smaller area (18U18 km2) centered on the rise (inner box of Figs.
1 and 2d). Our model provides addi-tional constraints on isotropic structure at distan-ces greater than 10 km from the rise axis. At these distances, velocities are generally faster to the east than to the west and increase with crustal age. a shallow origin, linked to offset intruding dikes from long, more continuous crustal reservoirs2,9.
Here we use seismic reﬂection data from the fast-spreading East Paciﬁc Rise, be-tween 8 N and 10 N, which includes a unique area where two documented volcanic eruptions have occurred10–15, to image the crustal magma bodies in high.The lower oceanic crust is the lower part of the oceanic crust and represents the major part of it (volumetrically biggest part).
It is generally located 4–8 km below the ocean floor and the major lithologies are mafic (ultramafic and gabbroic rocks) which derive from melts rising from the earth's mantle. This part of the oceanic crust is an important zone for processes such as melt.Results.
Seismic data obtained from a dense seismic array of 60 temporary stations were used to image the crustal structures. The stations oriented in a SE-NW direction with a spacing of 10–17 km crossed the northern NCC and eastern CAOB over a distance of ~ km from the China-North Korea border to the Sino-Mongolian border (Fig.
1).The stations were temporarily Cited by: