Japan Geoscience Union Meeting 2021

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S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG42] Frontier of Understanding Earth's Interior and Dynamics

Thu. Jun 3, 2021 5:15 PM - 6:30 PM Ch.15

convener:Hiroko Watanabe(Research Center for Neutrino Science, Tohoku University), Natsue Abe(Mantle Drilling Promotion Office, MarE3, Japan Agency for Marine-Earth Science and Technology), Tamano Omata(Japan Agency for Marine-Earth Science and Technology), F William McDonough(Department of Earth Science and Research Center for Neutrino Science, Tohoku University, Sendai, Miyagi 980-8578, Japan)

5:15 PM - 6:30 PM

[SCG42-P01] Model for anomalies in the Love wave dispersion

*Ranjith Kunnath1 (1.Mahindra University)

Keywords:Love wave, dispersion, slip wave

As is well known, there is a sharp change in the shear wave velocities across the interface between the crust and the upper mantle. If welded contact occurs at the interface, Love waves are generated when the earth is excited such as during an earthquake. However, anomalies in the Love wave dispersion have been observed, for example, by Ekström (2011). A model is presented which seems to capture the observed anomalies. In this model, slipping contact is assumed at the crust-mantle interface and a slip-weakening friction law is assumed to hold. When slipping contact occurs, a new type of an interfacial elastic wave, called the slip wave (Ranjith, 2017) can exist. The slip wave is a companion wave to the Love wave. The occurence of slip waves can explain the anomalies in the observed Love wave dispersion.