Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Coseismic and postseismic imaging of a composite fault system; the Samos 2020 M (sub w) 7.0 sequence

Ioannis Fountoulakis, Christos P. Evangelidis and Olga-Joan Ktenidou
Coseismic and postseismic imaging of a composite fault system; the Samos 2020 M (sub w) 7.0 sequence
Bulletin of the Seismological Society of America (March 2023) 113 (3): 997-1012

Abstract

The 2020 M (sub w) 7.0 Samos earthquake (eastern Aegean Sea) provides a rare chance to study the ongoing interaction of normal and strike-slip faulting during an aftershock sequence in a suspected transfer zone with differential deformation style. After assessing them for possible site-effect influence, we first backproject local strong-motion data to elicit the high-frequency (HF) radiation for the main seismic event using the Source Scanning Algorithm. Our results indicate the existence of multiple HF radiators during the main rupture. Second, we construct a new, high-precision catalog for the aftershock sequence utilizing a deep-learning-based detector and picker. This new catalog contains thousands of additional seismic events compared with the routine catalogs built by local agencies and is accompanied by an enhanced dataset of fault-plane solutions determined with automated techniques. Complex fault networks activated during the aftershock period are mapped in detail, indicating the existence of an active transtensional, possibly asymmetric, basin offshore Samos Island. This detailed seismological characterization of Samos sequence leads to an improved understanding of the controlling mechanisms that operate concurrently during a sequence in a transtensional type of system.


ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 113
Serial Issue: 3
Title: Coseismic and postseismic imaging of a composite fault system; the Samos 2020 M (sub w) 7.0 sequence
Affiliation: National Observatory of Athens, Institute of Geodynamics, Athens, Greece
Pages: 997-1012
Published: 20230308
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 82
Accession Number: 2023-025513
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N37°37'00" - N37°47'60", E26°34'60" - E27°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2023, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202317
Close Modal

or Create an Account

Close Modal
Close Modal