Overview of Data Quality, Availability and Performance of the 31 March 2020 Stanley, Idaho Event Aftershock Deployment
Session: Intermountain West Earthquakes in the Spring of 2020 [Poster]
Type: Poster
Date: 4/20/2021
Presentation Time: 11:30 AM Pacific
Description:
On March 31st, 2020, an Mw 6.5 event occurred 30 km to the northwest of Stanley, Idaho. Boise State University deployed a number of different sensors to better characterize the seismicity from the aftershocks. The deployment included 16 broadband seismometers scattered around the aftershock zone, 24 three-component Nodal 5 Hz geophones installed in a linear array near Stanley, Idaho and an irregular array near the epicenter of the main shock, 6 mini-infrasound arrays and finally a 24-element single infrasound array. In this presentation, we will present an overview of the deployment and instrumentation, data quality and noise levels of the broadband seismic instruments and finally, we will discuss the relocation of more than 1,000 aftershocks.
The 16 broadband stations consist of either a Nanometrics Meridian/Trillium Compact connected to either a Nanometrics Centaur or RefTex RT130 recording at 500 Hz and 200 Hz respectively. The nodal array consists of 24 Fairfield three-component Zland geophones sampling at 500 Hz. The average station spacing for the linear array is about 0.5 km and the irregular array was installed within 5 km of the epicenter of the mainshock with an aperture of about 1 km.
We use the probabilistic power spectral density (PSD) tools found in the Obspy python package to calculate noise models for each of the broadband stations and overall, the PSDs show strong data quality for the broadband stations. We further pick around 1,000 earthquakes of magnitude 2.5+ during the duration of the temporary deployment (~7 months) and relocate these events using the HypoDD software package to obtain higher quality locations. Preliminary results from HypoDD show many event hypocenters line up in a nearly vertical NE-trending plane with hypocenters progressing to the south of the main shock over time.
Presenting Author: Blaine Bockholt
Student Presenter: No
Authors
Blaine Bockholt Presenting Author Corresponding Author blaine.bockholt@inl.gov Idaho National Laboratory |
Thomas Mikesell dylanmikesell@boisestate.edu Boise State Univeristy |
Spencer Wilbur spencerwilbur@u.boisestate.edu Boise State University |
Lee Liberty lliberty@boisestate.edu Boise State University |
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Overview of Data Quality, Availability and Performance of the 31 March 2020 Stanley, Idaho Event Aftershock Deployment
Category
Intermountain West Earthquakes in the Spring of 2020