Lithospheric Delamination as the Driving Mechanism of Intermediate-depth Seismicity in the Bucaramanga Nest, Colombia

Author:

Pérez-Forero Diego1,Koulakov Ivan2,Vargas Carlos A.3,Gerya Taras4,Arifi Nassir Al5

Affiliation:

1. Institute of Petroleum Geology and Geophysics

2. Skolkovo Institute of Science and Technology (Skoltech), Bolshoy Blrd 30/1, Moscow 121205, Russia

3. Universidad Nacional de Colombia at Bogotá

4. ETH Zurich

5. Chair of Natural Hazards and Mineral Resources, Geology and Geophysics Department, King Saud University

Abstract

Abstract The Bucaramanga nest (BN) is an area of exceptionally strong intermediate-depth seismicity localized in a narrow zone at 150–170 km depth beneath the continental plate in Colombia. To explain the very unusual mantle seismicity cluster in this area, we built a seismic velocity model in the vicinity of BN with the use of local earthquake tomography and developed a numerical hydromechanical model. Our seismic model shows a strong high-velocity anomaly at 130–167 km coinciding with the BN seismicity. The relocated seismicity can be separated in two clusters. We propose that the upper BN cluster at ~ 130 km depth is attributed to dehydration embrittlement, whereas the lower BN cluster at ~ 150 km depth coinciding with the high-velocity body is caused by lithospheric delamination, creating a “drip” that falls down over the subducting oceanic plate, enhancing fluid release from the slab, potentially increasing seismicity.

Publisher

Research Square Platform LLC

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