Thermal squeezing of the seismogenic zone controlled rupture of the volcano-rooted Flores Thrust

Autor: Kyle Bradley, Karen H. Lythgoe, Muzli Muzli, Teng Wang, Andri Dian Nugraha, Sri Widiyantoro, Z. Zulfakriza, Shengji Wei
Přispěvatelé: Asian School of the Environment, Earth Observatory of Singapore
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Science Advances
Lythgoe, K, Muzli, M, Bradley, K, Wang, T, Nugraha, A D, Zulfakriza, Z, Widiyantoro, S & Wei, S 2021, ' Thermal squeezing of the seismogenic zone controlled rupture of the volcano-rooted Flores Thrust ', Science Advances . https://doi.org/10.1126/sciadv.abe2348
ISSN: 2375-2548
DOI: 10.1126/sciadv.abe2348
Popis: Volcanic heating of a tectonic fault changed the way it produces large earthquakes.
Temperature plays a critical role in defining the seismogenic zone, the area of the crust where earthquakes most commonly occur; however, thermal controls on fault ruptures are rarely observed directly. We used a rapidly deployed seismic array to monitor an unusual earthquake cascade in 2018 at Lombok, Indonesia, during which two magnitude 6.9 earthquakes with surprisingly different rupture characteristics nucleated beneath an active arc volcano. The thermal imprint of the volcano on the fault elevated the base of the seismogenic zone beneath the volcanic edifice by 8 km, while also reducing its width. This thermal “squeezing” directly controlled the location, directivity, dynamics, and magnitude of the earthquake cascade. Earthquake segmentation due to thermal structure can occur where strong temperature gradients exist on a fault.
Databáze: OpenAIRE