Multi-channel seismic imaging of a crustal magma chamber along the East Pacific Rise

@article{Detrick1987MultichannelSI,
  title={Multi-channel seismic imaging of a crustal magma chamber along the East Pacific Rise},
  author={Robert S. Detrick and Peter Buhl and Emilio E. Vera and John Colin Mutter and John A. Orcutt and John A. Madsen and Thomas M. Brocher},
  journal={Nature},
  year={1987},
  volume={326},
  pages={35-41}
}
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 crustal magma chamber located 1.2–2.4 km below the sea floor. The magma chamber is quite narrow (<4 – 6 km wide), but can be traced as a nearly continuous feature for tens of kilometres along the rise axis. 
The three-dimensional seismic velocity structure of the East Pacific Rise near latitude 9° 30′ N
Three-dimensional images of crustal seismic structure beneath the East Pacific Rise show pronounced axial heterogeneity over distances of a few kilometres. A linear high-velocity anomaly,Expand
A multi-sill magma plumbing system beneath the axis of the East Pacific Rise
At mid-ocean ridges, upper oceanic crust forms from a central magma reservoir, but it is unclear how the lower crust forms. Seismic data from the East Pacific Rise identify a series of smaller magmaExpand
Seismic constraints on shallow crustal emplacement processes at the fast spreading East Pacific Rise
We present the results of nine on-bottom seismic refraction experiments carried out over young East Pacific Rise crust. The experiments are unusual in that both the source and receiver are locatedExpand
Network of off-axis melt bodies at the East Pacific Rise
At faster-spreading mid-ocean ridges, the creation of new oceanic crust through magmatism usually occurs within a narrow zone on the ridge axis. Three-dimensional seismic images of the fast-spreadingExpand
Seismic Images of Active Magma Systems Beneath the East Pacific Rise Between 17�05' and 17�35'S
Seismic reflection data from the East Pacific Rise between 17�05' and 17�35'S image a magma lens that varies regularly in depth and width as ridge morphology changes, confirming the notion that axialExpand
The Seismic Attenuation Structure of a Fast-Spreading Mid-Ocean Ridge
The two-dimensional P-wave attenuation structure of the axial crust of the East Pacific Rise was obtained from an inversion of waveform spectra collected during an active-source seismic tomographyExpand
Tomographic image of the magma chamber at 12°50' N on the East Pacific Rise
THE East Pacific Rise at 12°50' N (Fig. 1) is a fast-spreading ridge with intense hydrothermal activity1, and ophiolite studies2 and thermal modelling3 indicate that this is a likely setting for aExpand
Seismic evidence for variations in axial magma chamber properties along the southern Juan de Fuca Ridge
Abstract Multichannel seismic data collected along the Cleft segment on the southern Juan de Fuca Ridge show that this intermediate-spreading center is underlain by a mid-crustal reflectorExpand
Seismic imaging of oceanic layer 2A between 9°30′N and 10°N on the East Pacific Rise from two‐ship wide‐aperture profiles
We analyze two-ship multichannel seismic wide aperture profiles (WAP) acquired on the East Pacific Rise (EPR) between 9°30′C and 10°N in May and June 1985. For offsets between 2 and 5 km, most of theExpand
Seismic Structure of the Southern East Pacific Rise
TLDR
Observations indicate that the paradigm of ridge crest magma chambers as small, sill-like, midcrustal bodies is applicable to a wide range of intermediate- and fast-spreading ridges. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 32 REFERENCES
Magma chamber and mantle reflections – East Pacific Rise
A multichannel seismic reflection profile of stacked and migrated common depth point data across the East Pacific Rise near the Siqueiros Fracture Zone supports and extends previous observations (atExpand
Petrological and tectonic segmentation of the East Pacific Rise, 5°30′–14°30′ N
Lavas from the fast-spreading East Pacific Rise are geochemically diverse even within a single tectonically defined spreading cell. Within such spreading cells, small offsets of the rise axis areExpand
Axial processes along a segment of the East Pacific Rise, 10°–12° N
Axial segments of the East Pacific Rise are made up of individual volcanoes. Each volcano has a distinct magma composition and shows a systematic variation in the fractional crystallization withExpand
A low velocity zone underlying a fast-spreading rise crest
WE present the results of an unreversed seismic refraction profile on the East Pacific Rise near the Siqueiros Fracture Zone recorded using a digital ocean bottom seismograph (OBS)1. An analysis of PExpand
Constraints on the structure of the East Pacific Rise from seismic refraction data
University of Washington seismic data taken during ROSE phase 1 have been used to study the structure of the East Pacific Rise in the vicinity of 12°N. Off axis but within 50 km of the axis we findExpand
The East Pacific Rise in cross section: A seismic model
In 1982 we undertook a seismic refraction experiment, known as the MAGMA expedition, to examine the detailed structure of the East Pacific Rise near 12°50′N. This segment of the rise, where the fullExpand
Compressional and shear wave structure of the East Pacific Rise at 11°20′N: Constraints from three‐component ocean bottom seismometer data
We report the analysis of seismograms from two orthogonal refraction lines in the ROSE area of the East Pacific Rise at 11°20′N recorded by a three-component ocean bottom seismometer (OBS). ConvertedExpand
East Pacific Rise Near 13�N: Geology of New Hydrothermal Fields
Abundant massive sulfide deposits are present at the crest of the East Pacific Rise near 13� North, where the opening rate is about 12 centimeters per year. Large manganese and helium-3 anomalies inExpand
Structure and variability of oceanic crust on the flanks of the East Pacific Rise between 11° and 13°N
We use over 500 seismograms collected by five ocean bottom seismometers to examine the structure and variability of 0.5-m.y.-old crust in the Rivera Ocean Seismic Experiment (ROSE) area of the EastExpand
The East Pacific Rise near 21°N, 13°N and 20°S: inferences for along-strike variability of axial processes of the Mid-Ocean Ridge
Abstract Data obtained along various segments of the Mid-Ocean Ridge (MOR) are used to construct an idealized model for crustal accretion. The model seeks to predict the topographic, volcanic,Expand
...
1
2
3
4
...