Premium
Tearing of the mantle lithosphere along the intermediate‐depth seismicity zone beneath the Gibraltar Arc: The onset of lithospheric delamination
Author(s) -
Heit Benjamin,
Mancilla Flor de Lis,
Yuan Xiaohui,
Morales Jose,
Stich Daniel,
Martín Rosa,
MolinaAguilera Antonio
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl073358
Subject(s) - geology , lithosphere , induced seismicity , mantle (geology) , asthenosphere , seismology , delamination (geology) , tectonics , geophysics
The intermediate‐depth seismicity (IDS) beneath the Gibraltar Arc is enigmatic. So far, there is no general consensus on its relationship with the ongoing tectonic processes. We analyzed S wave receiver functions (SRFs) with data recorded by a dense N‐S seismic profile deployed across the Sierra Nevada in southern Spain. SRF piercing points at depths of the lithosphere‐asthenosphere boundary (LAB) sample an area of the IDS zone, providing an ideal opportunity to study the lithospheric structure at the IDS zone. We observe an abrupt change in the LAB depth along a profile from north to south across the northern branch of the IDS. The LAB depth changes from 90 to 100 km north of the IDS to ~130 km south of it. We propose that the IDS marks a tear in the Iberian mantle lithosphere along its entire length, implying an ongoing lithospheric delamination process that produces the seismicity at its onset.