[OBSICtec] EarthScope Webinar - Thursday (2/22) @ 2p ET - Imaging the Cascadia Subduction Zone with Marine Active Source Seismic Data

[obsic at whoi.edu]

Upcoming Webinar.  Please contact Justin Sweet with any questions.

 

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Begin forwarded message:

 

From: Justin Sweet < <mailto:justin.sweet at earthscope.org>
justin.sweet at earthscope.org>

Subject: EarthScope Webinar - Thursday (2/22) @ 2p ET - Imaging the Cascadia
Subduction Zone with Marine Active Source Seismic Data

Date: February 7, 2024 at 9:09:09 AM MST

To: EarthScope General < <mailto:earthscope-general at earthscope.org>
earthscope-general at earthscope.org>

 

Please register for the next EarthScope Webinar happening Thursday, February
22nd at 2PM Eastern 

Title: Imaging the Cascadia Subduction Zone with Marine Active Source
Seismic Data 

 

Presenter: Dr Shuoshuo Han, University of Texas Institute for Geophysics


Register in advance for this webinar:
https://earthscope-org.zoom.us/webinar/register/WN_FrhYWFwIR7G3xuOt8hYSUA
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After registering, you will receive a confirmation email containing
information about joining the webinar. 


Abstract: The Cascadia subduction zone has hosted numerous great
earthquakes, up to Mw ~9.0, during the Holocene and poses a significant
earthquake and tsunami threat to the heavily populated Pacific Northwest.
However, with little instrumentally recorded seismicity, the geometry and
physical properties of the megathrust in the seismogenic zone are still
poorly known. In June-July 2021, we conducted the CAscadia Seismic Imaging
Experiment (CASIE21), a regional active source seismic survey on board R/V
Langseth to characterize the structure and physical properties of the
incoming plate, overriding plate, and the plate interface of the Cascadia
subduction zone. Multichannel seismic data were acquired using an air gun
source of 6600 in3 and a streamer of 12km/15km length. The new pre-stack
depth migrated seismic images and accompanying high-resolution velocity
models along 18 dip lines and 7 strike lines span the offshore region from
Vancouver Island to southern Oregon and provide new constraints on
megathrust geometry, structure and strength of the accretionary wedge, and
submarine landslides along this margin. Offshore Vancouver Island,
Washington, and northern Oregon, incoming sediments are fully accreted to
form an outer wedge of high seismic velocity. Offshore central and southern
Oregon, the decollement forms in the middle of the incoming sediment
section; the region of thick sediment underthrusting coincides with a narrow
outer wedge of low seismic velocity, and numerous massive paleo-landslide
deposits seaward of the deformation front. In this talk, I will present new
seismic images and high-resolution velocity models from the CASIE21
experiment. I will also discuss the causes of along strike variations of
outer wedge structure and strength in relation to sediment input and
backstop geometry, and their impact on plate interface slip behavior.


All EarthScope webinars are archived for later viewing at 

 
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https://www.youtube.com/playlist?list=PLGQwSTwiUcKwWZ9lhS2shpwMPwKSNl3Eo 

	
Justin Sweet, PhD


Project Manager

 


 <mailto:justin.sweet at earthscope.org> justin.sweet at earthscope.org


 
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