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Sediment mobilization deposits from episodic subsurface fluid flow; a new tool to reveal long-term earthquake records?

A. Reusch, J. Moernaut, F. S. Anselmetti and M. Strasser
Sediment mobilization deposits from episodic subsurface fluid flow; a new tool to reveal long-term earthquake records?
Geology (Boulder) (February 2016) Pre-Issue Publication

Abstract

Subsurface fluid flow can be affected by earthquakes; increased spring activity, mud volcano eruptions, groundwater fluctuations, changes in geyser frequency, and other forms of altered subsurface fluid flow have been documented during, after, or even prior to seismic shaking. Recently discovered giant pockmarks on the bottom of Lake Neuchatel, Switzerland, are the lake-floor expression of subsurface fluid flow. They discharge groundwater from the Jura Mountains karstic aquifers and experience episodically increased subsurface fluid flow documented by subsurface sediment mobilization deposits at the levees of the pockmarks. In this study, we present the spatio-temporal distribution of event deposits from these phases of sediment expulsion and of multiple time-correlative mass-transport deposits. We report five striking instances of concurrent multiple subsurface sediment deposits and multiple mass-transport deposits since late glacial times, for which we propose past earthquakes as a trigger. Comparison of this new event catalogue with historic earthquakes and other independent paleoseismic records suggests that initiation of sediment expulsion requires a minimum macroseismic intensity of VII. Thus, our study presents for the first time sedimentary deposits resulting from increased subsurface fluid flow as a paleoseismic proxy.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: Pre-Issue Publication
Title: Sediment mobilization deposits from episodic subsurface fluid flow; a new tool to reveal long-term earthquake records?
Affiliation: ETH Zuerich, Geological Institute, Zurich, Switzerland
Published: 20160224
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 26
Accession Number: 2016-025824
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., geol. sketch map
N46°53'60" - N46°53'60", E06°52'60" - E06°52'60"
Secondary Affiliation: University of Bern, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201613
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