Characterizing Analog Instrument Responses Relevant to Long-term Oceanic Microseism Analyses
Description:
Long-running seismological records of oceanic microseism intensity provide a unique quantitative resource to study historic storm systems and global climate change. However, one challenge in these studies is the accuracy and availability of sufficiently precise instrument responses for early seismic instruments. In this study, long-period Benioff data spanning 1935 to 1940 and digital broadband data from 1988 to present day recorded at the Harvard seismic station (HRV) are used to empirically constrain the analog instrument response of the analog seismometer using global earthquakes at teleseismic distances. The resulting instrument response correction demonstrates the feasibility of more widely using this methodology to recover missing instrument responses, or to correct inaccurate ones; and additionally assists in characterizing non-seismic long period noise for historical data. Applying this response correction at HRV yields preliminary observations of relative North Atlantic storm-associated microseism levels spanning more than 90 years.
Session: Geophysics in a Changing World: Monitoring Applications from Seismology and Beyond - I
Type: Oral
Date: 4/15/2025
Presentation Time: 04:45 PM (local time)
Presenting Author: Thomas
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Thomas Lee Presenting Author Corresponding Author thomaslee@princeton.edu Princeton University |
Richard Aster rick.aster@colostate.edu Colorado State University |
Miaki Ishii ishii@eps.harvard.edu Harvard University |
Hiromi Ishii ishii@eps.harvard.edu Harvard University |
Frederik Simons fjsimons@princeton.edu Princeton University |
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Characterizing Analog Instrument Responses Relevant to Long-term Oceanic Microseism Analyses
Category
Geophysics in a Changing World: Monitoring Applications from Seismology and Beyond