Please register for the next EarthScope Webinar happening Thursday, April 27th at 2PM Eastern
Title: Generous to a fault: Improving rapid earthquake slip characterization with both seismic and geodetic datasets
Presenter: Dr. Dara Goldberg, USGS
Register in advance for this webinar:
https://us06web.zoom.us/webinar/register/WN_YXhc607_SpGQPjZtqE7fIAAfter registering, you will receive a confirmation email containing information about joining the webinar.
Abstract:
Following
an earthquake of interest, deciphering the spatiotemporal details of
the rupture help to inform shaking predictions, loss estimates, and
damage assessments. Shaking is related to a location’s distance
from slip asperities; however, rupture directivity can result in
variable shaking and damage at different azimuths, despite similar
distances from the rupture. The U.S. Geological Survey National
Earthquake Information Center (NEIC) produces a slip model (known as a
finite fault model, FFM) within hours of a significant earthquake.
In the past, these models have been produced with broadband teleseismic
data, for which it is generally feasible to model earthquakes of
magnitude 7 and larger globally. Peer-reviewed research products have
demonstrated that incorporating regional-distance seismic and geodetic
observations, where available, can improve model quality and the
accuracy of downstream impact products. In addition, these high-quality
research products contribute to general knowledge of the earthquake
rupture process, including magnitude-dependent qualities of rupture
(i.e., earthquake scaling laws) and specific attributes of
well-instrumented fault systems (e.g., rupture propagation speeds). In
this talk, I will demonstrate recent updates to NEIC operations that
move us toward producing these joint regional/teleseismic
seismo-geodetic FFMs in a response time frame (hours).
Including regional seismic and geodetic datasets enhances our ability to
model smaller magnitude earthquakes than NEIC previously considered for
rapid slip characterization and improves model resolution for
earthquakes of any size. I will highlight recent results from the 2023
Kahramanmaraş, Türkiye, Earthquake Sequence. The integration of local
seismic and geodetic observations, available in the days following the
earthquakes, helped to clarify both the lateral- and depth-extent of
slip, and confirms the benefit of local observations in NEIC response
models.All EarthScope webinars are archived for later viewing at
| Justin Sweet, PhD |
Project Manager |