[ghsc-seminars] GHSC Special Seminar *HYBRID* - Susan Hough, May 11, 2023

[Llenos, Andrea L]

In addition to our regular GHSC Seminar on Tuesday, May 9, please join us for this special GHSC Seminar on Thursday, May 11!

The 1886 Charleston, South Carolina, Earthquake: Relic Railroad Offset Reveals Rupture

Speaker: Susan Hough
                 Earthquake Science Center
                 USGS
Location: Hybrid (online and in-person at 1711 Illinois St, Golden, CO, Rm 204)
                  *Non-USGS visitors welcome! Please bring a photo ID and arrive early to allow time to go through building security*
Date/Time: THURSDAY, MAY 11, 2023 10-11AM MDT

Abstract: One of the enduring mysteries in earthquake science has involved the earthquake that heavily damaged Charleston, South Carolina, in 1886.  Although it was large enough to cause chandeliers to swing in Detroit and Cuba, and documented by extensive contemporary observations, the causative fault(s) and seismotectonic framework for the Charleston Seismic Zone have remained poorly understood, with evidence of faulting obscured by saturated Atlantic Coastal Plain sediments.  A detailed consideration of archival accounts, regional stratigraphy and geomorphology, and inferred relic railroad offsets provide constraints with which an elastic deformation model can be developed, involving primary moment release on the Gants-Summerville fault. Modeling supports a moment magnitude on the upper end of the range estimated previously from macroseismic data alone: Mw7.3.  Ground motion predictions using an average of recently developed NGA-East ground motion models (GMMs) are highly consistent with the directly estimated near-field intensity distribution.  The suite of 17 NGA-East GMMs have high variability at magnitudes upwards of 6 due to a paucity of instrumental data.  Arguably, the independent constraint on Mw for the Charleston earthquake provides an opportunity to evaluate proposed models.

Bio: Susan Hough joined the Pasadena USGS office in 1992, when dinosaurs roamed the earth, having received her PhD from Scripps Institution of Oceanography in 1988 and spent four years at Lamont-Doherty Geological Observatory.  Her research interests include earthquake ground motions, induced and triggered earthquakes, and historical earthquakes.

For questions, comments, or speaker suggestions, please contact the GHSC Seminar Committee: Andrea Llenos <allenos at usgs.gov>, Benjamin Murphy <bmurphy at usgs.gov>, Lauren Schaefer <lschaefer at usgs.gov>

________________________________________________________________________________
Microsoft Teams meeting
Join on your computer, mobile app or room device
Click here to join the meeting<https://gcc02.safelinks.protection.outlook.com/ap/t-59584e83/?url=https%3A%2F%2Fteams.microsoft.com%2Fl%2Fmeetup-join%2F19%253ameeting_MjlkZmZlZGUtMWVkMi00NTM4LWFhMjUtZTlhNjVlNzhiZGMy%2540thread.v2%2F0%3Fcontext%3D%257b%2522Tid%2522%253a%25220693b5ba-4b18-4d7b-9341-f32f400a5494%2522%252c%2522Oid%2522%253a%252250f012ff-efbf-4efc-b34b-d5361c4364e5%2522%257d&data=05%7C01%7Cghsc-seminars%40geohazards.usgs.gov%7C983491a00142438706f308db4cbb57e3%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638188139731656112%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=EQEy5fHTUKO2h3SyqO88sBG4iy1eNBshKKcToC5hHK0%3D&reserved=0>
Meeting ID: 290 023 988 055
Passcode: trvCUp
Download Teams<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.microsoft.com%2Fen-us%2Fmicrosoft-teams%2Fdownload-app&data=05%7C01%7Cghsc-seminars%40geohazards.usgs.gov%7C983491a00142438706f308db4cbb57e3%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638188139731656112%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Vw4NEjMttiHTu9ufuYkHAJ0g4fLgamIxwzt2KPnDNWM%3D&reserved=0> | Join on the web<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.microsoft.com%2Fmicrosoft-teams%2Fjoin-a-meeting&data=05%7C01%7Cghsc-seminars%40geohazards.usgs.gov%7C983491a00142438706f308db4cbb57e3%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638188139731656112%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=EuZPsMZiZLc%2FDv5WJUV6qpVtZk57sClZYgmyHobhUW0%3D&reserved=0>
Learn More<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Faka.ms%2FJoinTeamsMeeting&data=05%7C01%7Cghsc-seminars%40geohazards.usgs.gov%7C983491a00142438706f308db4cbb57e3%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638188139731656112%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=XgxOEFUfDWua6%2Bt0oqsOI3lZM4I3Dw6BqRjBNz1EbuM%3D&reserved=0> | Meeting options<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fteams.microsoft.com%2FmeetingOptions%2F%3ForganizerId%3D50f012ff-efbf-4efc-b34b-d5361c4364e5%26tenantId%3D0693b5ba-4b18-4d7b-9341-f32f400a5494%26threadId%3D19_meeting_MjlkZmZlZGUtMWVkMi00NTM4LWFhMjUtZTlhNjVlNzhiZGMy%40thread.v2%26messageId%3D0%26language%3Den-US&data=05%7C01%7Cghsc-seminars%40geohazards.usgs.gov%7C983491a00142438706f308db4cbb57e3%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638188139731656112%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=1ONDjJzafZGxIX99Wlgo8EUMgJJLXULUqNLEekw64Z8%3D&reserved=0>
________________________________________________________________________________
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://geohazards.usgs.gov/pipermail/ghsc-seminars/attachments/20230504/93003e64/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/calendar
Size: 8701 bytes
Desc: not available
URL: <http://geohazards.usgs.gov/pipermail/ghsc-seminars/attachments/20230504/93003e64/attachment-0001.ics>