Processed seismic data of Cruise SO161 SPOC 2001

Within the frame of the comprehensive SPOC project (Subduction Processes off Chile) the SONNE cruises SO161 Leg 2 and 3 have been conducted between October 16th and November 29th, 2001, off central Chile between 28° and 44° S. In that period some 5,300 km were surveyed with multichannel seismic (MCS) reflection, magnetic, gravity, high-resolution bathymetric and echographic methods. In addition, approximately 3,900 km were surveyed with the same spectrum of methods but without MCS. The total number of 2D profiles was 48. Target was the variation of the subduction properties between the convergent oceanic Nazca and continental Southamerica plates and the different conditions that might influence the subduction process as there are: (1) age of the oceanic crust, (2) its structure and composition, (3) its sedimentary cover, (4) its thermal state, (5) the subduction angle and obliquity, and (6) the terrigenous sediment afflux from the continent. Furthermore, special focus was given to the subduction front, the subduction interface, the structure of the slope as well as to the forearc basin structure and history, and the general distribution of gas hydrate indicating bottom simulating reflectors (BSR's). The results are to be compared with previous studies of the Chilean active margin, e.g. CONDOR (SO 101 and 103) and CINCA (SO 104). The SPOC target area was subdivided into three sub-areas A,B and C. One area was chosen for a detailed survey by aid of a narrowly spaced grid and for a close link with a lot of partners. This area is characterized by a distinctly different margin type south of it is assumed. Moreover, the subducting portion of the aseismic Juan Fernandez Ridge is located in that area representing another important target of the survey. Advantageous conditions enabled the survey of an east-west profile south of Chiloé Island, providing a section through the submerged coastal Cordillera into the flooded longitudinal valley. Some results of Leg 2 and 3 are: In all areas A, B and C no subduction bulge (outer high) in the oceanic crust was visible perhaps due to the shortness of the profiles. The sedimentary cover of the oceanic crust is exceptionally thin, and the crustal thickness is generally quite "normal" with around 7 km derived from relatively weak Moho reflections. In area B a so far magnetically unmapped region was filled providing reliable ages of the oceanic crust, and suggesting that the Challenger Fracture Zone abruptly terminates west of the area of investigation. The survey in area C yielded valuable information on the trench morphology. The so far unique MCS profile south of Chiloé island shows a very wide trench and allows to extrapolate the general conditions encountered an area A southward to approximately 44° S. It can be stated that the situation is in sharp contrast to the basin structures detected by industry profiles further north in the Golfo de Corcovado.

Citation proposal
. Processed seismic data of Cruise SO161 SPOC 2001. https://gdk.gdi-de.org/geonetwork/srv/api/records/e4629f53-dc3b-4f7f-962f-ff16d5adcacd

Simple

Alternate title: SO161 SPOC 2001

Date ( Creation ): 2001-11-29

Identifier: a734d0d2-be18-aadb-01a0-a0c7f8506fcd

Status: completed Completed

Point of contact

Federal Institute for Geosciences and Natural Resources

Stilleweg 2 Hannover 30655

GEMET - INSPIRE themes, version 1.0 ( Theme )

Geologie
geology

GEMET - Concepts, version 2.4 ( Theme )

geophysics
Geophysik
raw material
Rohstoff

Keywords ( Theme )

Marine geology
Meeresgeologie
Seismics
Seismik
Two-dimensional seismic reflection
zweidimensionale Reflektionsseismik

Keywords ( Place )

Southeast Pacific Ocean
Südost-Pazifik
Chile

Access constraints: Other restrictions

Use constraints: Other restrictions

Other constraints: Allgemeine Geschäftsbedingungen, siehe http://www.bgr.bund.de/AGB - General terms and conditions, see http://www.bgr.bund.de/AGB_en. Die bereitgestellten Informationen sind bei Weiterverwendung wie folgt zu zitieren: Datenquelle: SO161 SPOC 2001, (c) BGR, Hannover, 2018

Spatial representation type: Vector

Metadata language: English

Character set: UTF8

Topic category

Geoscientific information

Distribution format

Shapefile (n/a )

Transfer size: 2

OnLine resource: SO161 SPOC 2001 (Shapefile)
SO161 SPOC 2001 im Format ESRI Shape

OnLine resource: Profile SO161-007
Profile SO161-007

OnLine resource: Profile SO161-008
Profile SO161-008

OnLine resource: Profile SO161-009
Profile SO161-009

OnLine resource: Profile SO161-012
Profile SO161-012

OnLine resource: Profile SO161-013
Profile SO161-013

OnLine resource: Profile SO161-014
Profile SO161-014

OnLine resource: Profile SO161-015
Profile SO161-015

OnLine resource: Profile SO161-016
Profile SO161-016

OnLine resource: Profile SO161-017
Profile SO161-017

OnLine resource: Profile SO161-019
Profile SO161-019

OnLine resource: Profile SO161-022
Profile SO161-022

OnLine resource: Profile SO161-023
Profile SO161-023

OnLine resource: Profile SO161-024
Profile SO161-024

OnLine resource: Profile SO161-025
Profile SO161-025

OnLine resource: Profile SO161-026
Profile SO161-026

OnLine resource: Profile SO161-027
Profile SO161-027

OnLine resource: Profile SO161-028
Profile SO161-028

OnLine resource: Profile SO161-029
Profile SO161-029

OnLine resource: Profile SO161-030
Profile SO161-030

OnLine resource: Profile SO161-031
Profile SO161-031

OnLine resource: Profile SO161-032
Profile SO161-032

OnLine resource: Profile SO161-033
Profile SO161-033

OnLine resource: Profile SO161-034
Profile SO161-034

OnLine resource: Profile SO161-035
Profile SO161-035

OnLine resource: Profile SO161-036
Profile SO161-036

OnLine resource: Profile SO161-037
Profile SO161-037

OnLine resource: Profile SO161-038
Profile SO161-038

OnLine resource: Profile SO161-040
Profile SO161-040

OnLine resource: Profile SO161-042
Profile SO161-042

OnLine resource: Profile SO161-043
Profile SO161-043

OnLine resource: Profile SO161-044
Profile SO161-044

OnLine resource: Profile SO161-045
Profile SO161-045

OnLine resource: Profile SO161-046
Profile SO161-046

OnLine resource: Profile SO161-047
Profile SO161-047

OnLine resource: Karte im BGR-Geoviewer
Karte im BGR-Geoviewer

Hierarchy level: Dataset

Conformance result

Date ( Publication ): 2010-12-08

Explanation: siehe dazu die angegebene Durchführungsbestimmung

Statement: During the period from 16th October 2001 to 29th November 2001 BGR acquired seismic lines off the Atlantic coast of South America. Lines SO161-018 and SO161-046G consist of raw data. Lines SO161-007, SO161-022, SO161-038, SO161-040 and SO161-046 consist of stacked data. Lines SO161-008, SO161-009, SO161-012, SO161-013, SO161-014, SO161-015, SO161-016, SO161-017, SO161-019, SO161-023, SO161-024, SO161-025, SO161-026, SO161-027, SO161-028, SO161-029, SO161-030, SO161-031, SO161-032, SO161-033, SO161-034, SO161-035, SO161-036, SO161-037, SO161-042, SO161-043, SO161-044, SO161-045, SO161-047 are migrated data.