Universität zu Köln

Jara-Munoz, J., Melnick, D., Li, S., Socquet, A., Cortes-Aranda, J., Brill, D. and Strecker, M. R. (2022). The cryptic seismic potential of the Pichilemu blind fault in Chile revealed by off-fault geomorphology. Nat. Commun., 13 (1). BERLIN: NATURE PORTFOLIO. ISSN 2041-1723

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Abstract

The first step towards assessing hazards in seismically active regions involves mapping capable faults and estimating their recurrence times. While the mapping of active faults is commonly based on distinct geologic and geomorphic features evident at the surface, mapping blind seismogenic faults is complicated by the absence of on-fault diagnostic features. Here we investigated the Pichilemu Fault in coastal Chile, unknown until it generated a Mw 7.0 earthquake in 2010. The lack of evident surface faulting suggests activity along a partly-hidden blind fault. We used off-fault deformed marine terraces to estimate a fault-slip rate of 0.52 +/- 0.04 m/ka, which, when integrated with satellite geodesy suggests a 2.12 +/- 0.2 ka recurrence time for Mw similar to 7.0 normal-faulting earthquakes. We propose that extension in the Pichilemu region is associated with stress changes during megathrust earthquakes and accommodated by sporadic slip during upper-plate earthquakes, which has implications for assessing the seismic potential of cryptic faults along convergent margins and elsewhere.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jara-Munoz, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Melnick, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Socquet, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cortes-Aranda, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brill, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strecker, M. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-691589
DOI:	10.1038/s41467-022-30754-1
Journal or Publication Title:	Nat. Commun.
Volume:	13
Number:	1
Date:	2022
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language M-W 9.0; SUBDUCTION ZONE; MARINE TERRACES; SPLAY FAULT; EARTHQUAKE RUPTURE; COASTAL CORDILLERA; ACTIVE TECTONICS; MAULE EARTHQUAKE; HIGH-RESOLUTION; PACIFIC COAST Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/69158