Séminaire ISTerre

---

Seismo-acoustic observations and machine learning applied to the 2020 Stanley, Idaho, earthquake aftershock sequence

jeudi 23 juin 2022 - 11h00

Dylan Mikesell - Norwegian Geotechnical Institute
--- 
The March 31, 2020, Mw6.5 Stanley, Idaho, earthquake was recorded by a sparse regional network of permanent seismic stations. Following the mainshock, a local network of 15 seismic stations within and surrounding the epicentral zone was installed. In addition, within 25 km of the hypocenter a network of six three-element infrasound arrays were co-located with some of the broadband seismometers. A 24-element infrasound array, as well as two small nodal arrays were also deployed for the first month following the mainshock. The real-time part of the temporary seismic network (2 stations) enabled local P- and S-wave phase picking and helped the USGS to produce a robust aftershock catalog. To date, more than 2500 aftershocks above Mw2.4 exist in the USGS catalog. Since 2020 we have been working to understand the unique seismo-acoustic observations provided by this dataset. In addition, we are using machine learning tools to further improve the USGS aftershock catalog to better understand the tectonics in this area -- a very sparsely instrumented and populated area of the Western United States. In this presentation, I will share our results to date, as well as discuss outstanding questions.

---

Equipe organisatrice : Ondes et structures

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

Informations de visio :

https://univ-grenoble-alpes-fr.zoom.us/j/96913102209?pwd=aCthMFNEV0lmRGxqd3h5K3p5QWpHZz09