Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study.

ABSTRACT: Stripe-like patterns of surface wave arrival angle deviations have been observed by several seismological studies around the world, but this phenomenon has not been explained so far. Here we test the hypothesis that systematic arrival angle deviations observed at the AlpArray broadband seismic network in Europe are interference patterns caused by diffraction of surface waves at single small-scaled velocity anomalies. We use the observed pattern of Rayleigh waves from two earthquakes under the Southern Atlantic Ocean, and we fit this pattern with theoretical arrival angles derived by a simple modeling approach describing the interaction of a seismic wavefield with small anomalies. A grid search inversion scheme is implemented, which indicates that the anomaly is located in Central Africa, w

SUBMITTER: Kolinsky P 

PROVIDER: S-EPMC7507139 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature