Objectives
A session focused on comparative studies across subduction zones to understand the drivers of geohazards
Please join us on Thursday, December 18, and Friday, December 19 for the SZ4D oral and poster sessions: The SZ4D Experiment: Comparing Subduction Zone Processes Across Three Margins.
Session Description
Understanding the processes controlling landslides, earthquakes, volcanic eruptions and tsunamis requires utilizing natural experiments to identify and isolate controlling factors. How do climate and tectonics interact to determine the susceptibility to landslides? What is the relative importance of magma supply and crustal faulting in controlling eruptive frequency? Are the size and location of earthquakes affected by structural boundaries? These and other geohazard questions can be addressed by studying behaviors across subduction zones. We invite contributions that use the power of comparison across multiple subduction zones to develop new insights. Observational, theoretical and laboratory studies comparing the SZ4D focus areas of Cascadia, Alaska and Chile are particularly welcome.
The SZ4D Science Program at the AGU Fall Meeting
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Organizers
Primary Convener: Emily E Brodsky (University of California Santa Cruz)
Conveners: Cristian A. Farías (Universidad Católica de Temuco), Demian M. Saffer (Pennsylvania State University), Alice-Agnes Gabriel (Ludwig-Maximilians-Universität München)
Agenda
Oral Session
🗓️ Thursday, 18 December 2025
🕐 14:15 - 15:45
📍 353 (New Orleans Convention Center)
14:15 | T43B-01 - Near-surface processes during and after laccolith emplacement and volcanic eruption at Cordon Caulle, Chile - The CHILCO project
Philipp Ruprecht (Invited)
14:25 | T43B-02 - Erosion dynamics and sediment distribution on the Mataquito River, Chile
Grant Long
14:35 | T43B-03 - Global Trench-Parallel Inner Forearc Deformation Dictated by Subduction Zone Obliquity
Kristin D Morell (Invited)
14:45 | T43B-04 - Fault Failure Mechanisms and Slip Modes Along the Shallow Subduction Interface: Insights from an Exhumed Accretionary Complex in Alaska
Whitney M Behr
14:55 | T43B-05 - Earthquake Source Characterization Using DAS at Cook Inlet, Alaska
Verónica Gaete-Elgueta
15:05 | T43B-06 - Earthquake stress drops in the Alaska, north-central Chile, and Tonga subduction zones
Songqiao Shawn Wei
15:15 | T43B-07 - Late Triggered Megathrust slip following the 2020 Mw7.6 Sand Point Alaska Strike-Slip Earthquake Could Explain its Tsunami
Revathy Mozhikunnath Parameswaran
15:25 | T43B-08 The 2020-2025 Alaska Peninsula Earthquake Sequence and Implications for Megathrust Slip Budget and the Earthquake Cycle
Jeffrey Todd Freymueller (Invited)
15:35 | T43B-09 Comparing seismic attenuation structures of the Tonga and north-central Chile subduction zones
Yurong Zhang
Poster Session
🗓️ Friday, 19 December 2025
🕐 08:30 - 12:00
📍 Hall EFG (Poster Hall) (New Orleans Convention Center)
Precursory Patterns Prior to the July 2020 Mw 7.8 Simeonof, Alaska Earthquake Revealed in an Enhanced Microseismicity Catalog
Coralis Del Mar Friedman Alvarez
Active Coastal Uplift in South-Central Chile Imaged by Erosion Rates and River Profiles in the Rapel River Watershed
Grant Long
3D Modeling of Slab-edge Driven Mantle Flow in the Cascadia Subduction Zone
Clayton Kolke
Imaging the Alaskan Subduction Zone Using Love Wave Phase Velocity Tomography
Cristo Ramirez
Improved Slab Imaging in the Alaskan Peninsula Through Converted Wave Detection
Andrew Birkey
Rayleigh and Shear Wave Imaging of the Alaskan Subduction Margin
Aubreya Nicole Adams
Seismic Tomography of the Alaska Subduction Zone Using Distributed Acoustic Sensing (DAS)
Anjani Mirchandani
Structure of the megathrust: amphibious imaging the Kodiak segment of the M9.2 1964 rupture zone
Geoffrey A Abers
Bayesian Joint Inversion of Coseismic Slip and Afterslip for the 2020 Mw 7.8 Simeonof Earthquake
Zechao Zhuo
Shallow Aftershocks Beyond the Updip Coseismic Slip Limit Revealed by a Machine Learning Catalog from RAPID Response and Permanent Seismic Stations
Hanqi Zhu
Offshore Observations Improve Earthquake Locations and Reveal Seismicity Near the Megathrust in the Alaska-Aleutian Subduction Zone
Sarah Nolan
Why do foreshocks occur where they do?
Emily E Brodsky
SZ4D events at AGU Fall Meetings are supported by the National Science Foundation