Earthquakes and Low-Frequency Signals Recorded From the Great Lakes

Session: Environmental and Near Surface Seismology: From Glaciers and Rivers to Engineered Structures and Beyond [Poster]
Type: Poster
Date: 4/29/2020
Time: 08:00 AM
Room: Ballroom
Description: 

The relationship between large water volume and local seismic activity gathers more attention due to the potential hazard in populated region. A steady increase in the water level of the Great Lakes is observed since 2013 and it causes wide concerns of potential flood and severe weather conditions around the Lakes. Meanwhile, a M_L4.0 earthquake struck Lake Erie on June 10^th 2019, which is the largest earthquake surrounding this region since 2013. This raises up a scientific question of whether the increasing water level changes the stress state of local faults and promotes the mainshock. To better understand this potential relationship between the lake and seismicity, we investigate the long-term seismic behavior leading up to the mainshock. To identify any possible missing earthquake, a single-station matched filter technique was utilized to match the continuous recording of station M52A, which is available starting from mid-January 2013. Further clustering analysis helps to distinguish repetitive events from different sources, resulting in ~120 clusters of signals with varying dominant frequencies. Beyond local earthquakes, we also detect intriguing events with dominating lower frequencies (1-5HZ) as well as events likely associated with mining and regional earthquakes. We will also present new analysis including wave polarity and event locations, to better constrain the source information for different clusters and further examine the link between the lake and events that occur around it.

Presenting Author: Dongdong Yao

Authors