Reflection and Refraction Seismic Methods

Crutchley, Gareth; Kopp, Heidrun

doi:10.1007/978-3-319-57852-1_4

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…2c). In some cases, the reflectivity between two sediment layers did not provide enough acoustic impedance contrast to generate strong seismic reflectors due to velocity and density contrasts inherent in seafloor sediments (Crutchley and Kopp, 2018). Thus, the heterogeneous composition coupled to the vertical degradation of the matte over millennia result in difficulties in associating the structure of the matte with specific seismic facies (Lo Iacono et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Sizing the carbon sink associated with Posidonia oceanica seagrass meadows using very high-resolution seismic reflection imaging

Monnier

Pergent

Carbonell

et al. 2021

Marine Environmental Research

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Section: Discussionmentioning

confidence: 99%

Sizing the carbon sink associated with Posidonia oceanica seagrass meadows using very high-resolution seismic reflection imaging

Monnier

Pergent

Carbonell

et al. 2021

Marine Environmental Research

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“…One such portable high-resolution system, the P-Cable system developed by Geometrics, Inc. employs 14 short (50 m) streamers attached to a cross-cable (Figure 3) (Crutchley and Kopp, 2018). The cross-cable is kept under tension by two one-ton paravanes attached to the ends of the cross-cable on both the port and starboard side of the stern via tow cables.…”

Section: D Seismic Reflection Acquisition and Processingmentioning

confidence: 99%

“…We measured a peak frequency of 125 Hz that allowed a minimum vertical resolution of 3 m. Shallow structure and deformation were overprinted and masked by the strong reflectors inherent in the seismic source signature. The 3D data were processed by Geotrace Technologies, a petroleum services company, given the enormous size of the data volume (20 GB per seismic attribute volume) and their previous experience with processing 3D P-Cable data acquired in other surveys (Crutchley and Kopp, 2018). A detailed report outlining the seismic processing workflow is provided in Supplemental Material.…”

Section: D Seismic Reflection Acquisition and Processingmentioning

confidence: 99%

Revealing Geometry and Fault Interaction on a Complex Structural System Based on 3D P-Cable Data: The San Mateo and San Onofre Trends, Offshore Southern California

et al. 2021

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Deformation observed along the San Mateo (SMT) and San Onofre trends (SOT) in southern California has been explained by two opposing structural models, which have very different hazard implications for the coastal region. One model predicts that the deformation is transpressional in a predominantly right lateral fault system with left lateral step-overs. Conversely in the alternative model, the deformation is predicted to be compressional associated with a regional blind thrust that reactivated detachment faults along the continental margin. State-of-the-art 3D P-Cable seismic data were acquired to characterize the geometry and linkage of faults in the SMT and SOT. The new observations provide evidence that deformation along the slope is more consistent with step-over geometry than a regional blind thrust model. For example, regions in the SOT exhibit small scale compressional structures that deflect canyons along jogs in the fault segments across the slope. The deformation observed in the SMT along northwesterly trending faults has a mounded, bulbous character in the swath bathymetry data with steep slopes ( ∼ 25°) separating the toe of the slope and the basin floor. The faulting and folding in the SMT are very localized and occur where the faults trend more northwesterly (average trend ∼ 285°) with the deformation dying away both towards the north and east. In comparison, the SOT faults trend more northerly (average trend ∼ 345°). The boundary between these fault systems is abrupt and characterized by shorter faults that appear to be recording right lateral displacement and possibly accommodating the deformation between the two larger fault systems. Onlapping undeformed turbidite layers reveal that the deformation associated with both major fault systems may be inactive and radiocarbon dating suggests deformation ceased in the middle to late Pleistocene (between 184 and 368 kyr). In summary, our preferred conceptual model for tectonic deformation along the SMT and SOT is best explained by left lateral step-overs along the predominantly right lateral strike-slip fault systems.

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“…The seafloors and subsurfaces of numerous volcanic archipelagos have now been imaged in unprecedented detail thanks to advances in a range of geophysical techniques such as single and multibeam echo sounders, sidescan sonar, and reflection and refraction seismic surveys (e.g. Crutchley and Kopp 2018;Hughes Clark 2018;Klaucke 2018). Giant landslides on volcanic islands transport hundreds of thousands of cubic metres to hundreds of cubic kilometres of material and create arcuate embayments and steep cliffs (Fig.…”

Section: Introductionmentioning

confidence: 99%

A Global Database of Giant Landslides on Volcanic Islands

Rowberry

Klimeš

Blahůt

et al. 2023

Progress in Landslide Research and Technology

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This paper describes a comprehensive online database of giant landslides on volcanic islands compiled by researchers from the Institute of Rock Structure and Mechanics, Czech Academy of Sciences, in the framework of IPL Project 212. The database was constructed from 2016 to 2018. It comprises a total of seventy-five events from the Atlantic Ocean and Mediterranean Sea, sixty-seven events from the Pacific Ocean, and forty events from the Indian Ocean. In this paper some of the main benefits of landslide inventories and thematic databases are outlined and the global distribution of giant landslides on volcanic islands is described in depth. The database is hosted on the website of the Institute of Rock Structure & Mechanics and records can be downloaded as a spreadsheet or kml file for integration in a number of geospatial programs including ArcGIS and Google Earth. However, since completion of the database in 2018, a number of potentially significant studies of giant landslides on volcanic islands have been published from archipelagos in the Atlantic and Pacific Oceans while outstanding modern analogues for past events are represented by the collapse of Anak Krakatau on 22 December 2018 and the collapse of Hunga Tonga-Hunga Haʻapai on 15 January 2022. Consequently, the recent literature will be scrutinized with the aim of updating information already contained in the database while two new layers are planned: the first of these will provide information about recent volcanic collapses and the second will provide information about the long-term instrumental monitoring of giant landslides. It is intended that the second release of the database will be available online in early 2023.

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Reflection and Refraction Seismic Methods

Cited by 9 publications

References 30 publications

Sizing the carbon sink associated with Posidonia oceanica seagrass meadows using very high-resolution seismic reflection imaging

Sizing the carbon sink associated with Posidonia oceanica seagrass meadows using very high-resolution seismic reflection imaging

Revealing Geometry and Fault Interaction on a Complex Structural System Based on 3D P-Cable Data: The San Mateo and San Onofre Trends, Offshore Southern California

A Global Database of Giant Landslides on Volcanic Islands

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