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The Reelfoot magnetic anomaly and its relationship to the Pascola Arch and the Reelfoot Fault

Ivan Rabak, Charles Langston and Christine Powell
The Reelfoot magnetic anomaly and its relationship to the Pascola Arch and the Reelfoot Fault
Seismological Research Letters (February 2011) 82 (1): 132-140

Abstract

Most contemporary New Madrid seismic zone earthquakes correlate geographically with the location of a basement uplift, the Pascola Arch, and a distinct magnetic anomaly called the Reelfoot magnetic anomaly (RMA). We invert magnetic data for several profiles crossing the RMA and demonstrate that the anomaly is produced by an igneous intrusion related to the formation of the Pascola Arch. The models require approximately 2 km of vertical uplift on crystalline basement rock, indicating that structure associated with the Pascola Arch extends below Paleozoic rocks. The modeled uplift corresponds to estimates of Paleozoic sediment erosion from the top of the arch. We suggest that faulting accompanied emplacement of the RMA intrusion, establishing a zone of weakness in the upper crust that manifests today as the Reelfoot fault. Faulting accompanying intrusion provides an explanation for why earthquakes occur within the RMA intrusion rather than surrounding it, as is the case with all other intrusions emplaced along the margins and axis of the Reelfoot Graben.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 82
Serial Issue: 1
Title: The Reelfoot magnetic anomaly and its relationship to the Pascola Arch and the Reelfoot Fault
Affiliation: University of Memphis, Center for Earthquake Research and Information, Memphis, TN, United States
Pages: 132-140
Published: 201102
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 39
Accession Number: 2011-019830
Categories: SeismologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N30°00'00" - N35°00'00", W88°30'00" - W85°00'00"
N33°00'00" - N36°30'00", W94°40'00" - W89°40'00"
N37°00'00" - N42°30'00", W91°30'00" - W87°30'00"
N36°30'00" - N39°10'00", W89°40'00" - W82°00'00"
N30°15'00" - N35°00'00", W91°40'00" - W88°04'60"
N36°00'00" - N40°34'60", W95°45'00" - W89°04'60"
N35°00'00" - N36°45'00", W90°15'00" - W81°40'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201112
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