Home  /  SCEC Meetings and Workshops  /  2021 SCEC Annual Meeting  /  Abstracts

SCEC Annual Meeting Banner

AGENDA REGISTRATION ABSTRACTS PARTICIPANTS FAQ

SCEC 2021 Meeting Abstracts

SCEC Annual Meeting participants are invited to share recent results and activities relevant to SCEC priorities and initiatives during the poster sessions. The SCEC collaboration emphasizes the connections between information gathering by sensor networks, fieldwork, and laboratory experiments; knowledge formulation through physics-based, system-level modeling; improved understanding of seismic hazard; and actions to reduce earthquake risk and promote resilience.

Use the search form to view abstracts of presentations that have been accepted for this meeting.


  
  

A SCEC username is required to submit an abstract.

The person submitting the abstract is automatically the First Author, and will receive all communications regarding the abstract.

A First Author can have a maximum of one poster and one oral presentation (if invited as a plenary speaker).

Abstracts should not exceed 2,500 characters in length.

Each "poster space" in the online gallery will include general poster information, author contact information, and a PDF of the poster, as well as optional short videos about the poster.

First Authors of accepted abstracts will receive more detailed instructions.

Results 1-43 of 43
SCEC ID Category Title and Authors SCEC Award
Poster
TBD
FARM Very long timescale of grain size and shear zone evolution in a continental strike-slip setting
Kali Allison, Laurent Montesi
Understanding the mechanical interaction between brittle faults and deeper ductile shear zones provides insights into the long-term behavior of active fault systems. We explore this interaction in a 2D model of a continental strike-slip fault zone.... more
20191
Poster
TBD
FARM Using Active Source Seismology to Image a Strike-Slip Fault Damage Zone as a Function of Depth, Distance, and Geology
Travis Alongi, Emily Brodsky, Jared Kluesner, Daniel Brothers
Fault damage zones provide a window into the non-elastic processes and products of an earthquake, but geological and seismic tomography methods have limited resolution and in particular have been unable to measure damage zones at depth with... more
21182
Talk
TBD
Geology What can hematite (U-Th)/He thermochronometry tell us about fault mechanics in the shallow crust?
Alexis Ault
Above the seismogenic zone, earthquake ruptures may propagate to the surface along discrete fault planes or earthquake energy is attenuated in fault damage zones. Forecasting earthquake hazards requires knowledge of the slip distribution and... more
21068, 17164, 14125
Poster
TBD
Geology Assessment of the paleoseismic potential of the Ferrum site along the southernmost San Andreas fault using new UAV imagery, GPR data, and preliminary trenching
William Buckley, Thomas Rockwell, Katherine Scharer, Paula Figueiredo, Zoe Morgan
We initiated studies along the southern San Andreas fault at Ferrum, CA, where a double releasing bend has ponded Holocene alluvium against an uphill-facing scarp. Ferrum is located along the east side of the Salton Sea between Bombay Beach and... more

Poster
TBD
FARM Uncertainty Quantification of Dynamic Rupture Modeling
Eric Daub, Hamid Arabnejad, Derek Groen
We present a demonstration using a surrogate-model based Uncertainty Quantification (UQ) approach to study dynamic earthquake rupture on a rough fault surface. The UQ approach performs model calibration where we choose simulation points, fit and... more

Talk
TBD
FARM Investigating the Influence of Topography on Rupture Propagation along Fault Stepovers
Roby Douilly
Complex fault systems are often located in regions with asymmetric topography, and these systems are very common in Southern California. As an example, the eastern portion of the left-lateral Garlock fault system, which is composed of two segments... more

Talk
TBD
FARM Towards modeling sequence of earthquakes and aseismic slip (SEAS) with high resolution fault zone physics
Ahmed Elbanna, Mohamed Abdelmeguid, Md Shumon Mia, Xiao Ma
An active fault zone is home to a plethora of complex structural and geometric features that are expected to affect earthquake rupture nucleation, propagation, and arrest, as well as interseismic deformation, energy partitioning, radiation patterns... more

Talk
TBD
CXM Current status and future of the Community Geodetic Model
Michael Floyd
On behalf of the Community Geodetic Model (CGM) Working Group, I present the current status of the CGM and future plans and challenges. The CGM provides the SCEC community, and beyond, with Earth surface displacements and velocities from two... more
21026, 20182, 20074, 20177, 20198, 20016, 19234
Poster
TBD
SAFS New insights on subsurface fault and geologic structure at Loma Prieta, central California
Gary Fuis, Rufus Catchings, Mark Goldman, Daniel Scheirer, Tait Earney, Klaus Bauer, Edward Zhang
In light of recent interpretations of a two-part dip for the San Andreas fault (SAF) in the Coachella Valley, of southern California, we have compiled data sets and analyses in the vicinity of the 1989 Mw 6.9 Loma Prieta earthquake, in central... more

Poster
TBD
EFP Relative structural complexity of plate boundary fault systems controls incremental slip-rate behavior of major strike-slip faults
Judith Gauriau, James Dolan
A comparison of published incremental fault slip rates from four major plate-boundary strike-slip faults with the proximity and number of other neighboring active faults shows that the behavior of the master fault is strongly correlated with the... more

Poster
TBD
FARM More than 40 years of potentially induced seismicity close to the San Andreas fault in San Ardo, central California
Thomas Goebel, Manoochehr Shirzaei
Evidence for fluid injection-induced seismicity is rare in California hydrocarbon basins, despite wide-spread injection close to seismically active faults. We investigate a potential case of injection-induced earthquakes associated with San Ardo... more
21008
Talk
TBD
Geology Coseismic surface rupture: insights from field and satellite observations
Ryan Gold
High-resolution satellite observations provide unprecedented constraints on surface-rupturing earthquakes, yielding detailed insight into the patterns of localized and distributed faulting extending multiple kilometers across the rupture zone. Field... more

Talk
TBD
CXM The SCEC Community Rheology Model: A modular resource for investigating the effective viscosity structure of southern California
Elizabeth Hearn, Laurent Montesi, Greg Hirth, Michael Oskin, Whitney Behr, Wayne Thatcher
The SCEC Community Rheology Model (CRM) comprises a 3D geologic framework model (GFM) of southern California’s lithosphere, and ductile flow laws for each GFM rock type. The GFM is shared as coordinates for 23 lithotectonic province boundaries,... more
20190
Poster
TBD
Geology Cosmogenic 3He exposure dating of alluvial surfaces using detrital magnetite enabled by microCT scanning
Florian Hofmann, Emily Cooperdock, A. Joshua West, Dominic Hildebrandt, Kathrin Strößner, Kenneth Farley
We have tested whether X-ray micro-computed tomography (microCT) scanning can be used to improve the quality of cosmogenic 3He exposure dating of magnetite by pre-selecting mineral grains without inclusions. We extracted detrital magnetite from a... more
20146
Talk
TBD
FARM Characteristics of earthquakes in damaged, heterogeneous, and temporally evolving fault zones
Yihe Huang, Prithvi Thakur
Instead of single planes, faults are volumes of rocks containing fault cores surrounded by hundreds-meter-thick fractured rocks, i.e., the so-called fault damage zones. Major fault zones accommodate a significant portion of plate motion through... more
17071, 20091
Poster
TBD
Geology Role of Confinement in Coseismic Pulverization of Sediments: Testing the Rock Record of Rupture Directivity on the San Jacinto Fault
Caje Kindred, W. Ashley Griffith, Thomas Rockwell
Recent observations within Anza Borrego State Park, where the San Jacinto Fault juxtaposes Pleistocene Bautista Formation sediments against Cretaceous tonalite, display a stark contrast across the fault and at varying depths. In particular, while... more
20027
Poster
TBD
FARM Induced seismicity spikes during abrupt changes in injection and production rates in geothermal reservoirs
Roshan Koirala, Emily Brodsky, Thomas Goebel, Grzegorz Kwiatek
Fluid injection in deep geothermal reservoirs can result in fluid pressure changes that are sufficiently high to induce seismicity. There are, however, some examples of seismic activity during a decrease in injection rates. Here, we analyze the... more

Poster
TBD
SAFS Observation-constrained multicycle dynamic models of the southern San Andreas and San Jacinto faults: addressing complexity in paleoearthquake models with realistic fault geometry
Dunyu Liu, Benchun Duan, Katherine Scharer, Doug Yule
Understanding the mechanical conditions that lead to complexities in earthquake observations is important to seismic hazard analysis. In this study, we simulate physics-based multicycle dynamic models of the southern San Andreas fault (Cajon Pass to... more
20138, 19238
Talk
TBD
Seismology Distributed acoustic sensing using long range submarine fiber-optic cables
Bin Luo, Robert Clapp, Ariel Lellouch, Biondo Biondi
The utilization of the emerging distributed acoustic sensing (DAS) technique with pre-existing submarine fiber-optic cables in recent years has demonstrated itself a promising strategy to deploy cost-effective dense arrays on the seafloor and to... more

Poster
TBD
FARM Investigating the Effects of Fault Dip Angle on Rupture Propagation Along Branch Fault Systems Using Dynamic Rupture Simulations
Evan Marschall, Roby Douilly
An important consideration in assessing seismic hazards is determining what is likely to happen when an earthquake rupture encounters a geometric complexity such as a branch fault. Previous studies showed parameters such as branch angle, stress-... more
21084
Talk
TBD
CS Advances in passive seismic algorithms for large-scale DAS data
Eileen Martin, Joseph Kump, Sarah Morgan, Brandon Pearl, Tony Artis, Samantha Paulus
Distributed acoustic sensing (DAS) allows us to more easily collect long-term data to study earthquake processes at fine scales across large regions, so DAS data rates are often thousands of times higher than traditional seismometer data rates. This... more

Poster
TBD
SDOT Temperature Variations at the Base of the Seismogenic Zone throughout Southern California
Suerken Matsuyama, Laurent Montesi
Earthquakes activity stops at a depth of between 12 and 15 km on most continental fault strands, including in the San Andreas Fault System and the North Anatolian Fault. One possible explanation for this transition is that earthquakes are limited by... more
19145
Poster
TBD
FARM Explore the mechanism of tsunami earthquake generation using earthquake cycle simulation
Qingjun Meng, Benchun Duan, Bin Luo
Since 1900, nine Mw>=7.5 historical tsunami earthquakes have occurred along shallow subduction zones and generated larger tsunami hazards than their Ms magnitudes implied. Previous observations found that tsunami earthquakes propagate at slower... more

Talk
TBD
Geodesy Characterizing the Deformation and Hazard of Fault Zones Using Geodetic Imaging Data
Chris Milliner, Jean-Philippe Avouac, Saif Aati, Rui Chen, Brian Chiou, Timothy Dawson, Andrea Donnellan, James Dolan
Understanding how inelastic, co-seismic shear strain attenuates with distance away from the primary fault rupture is important for accurately characterizing the hazard it poses to critical infrastructure and estimating the full geologic slip rate.... more
19222
Poster
TBD
SDOT Resolving Coseismic Stresses Using 3D Geodetic Imaging Data: Examples from the 2019 Ridgecrest Earthquake Sequence
Chris Milliner, Saif Aati, Jean-Philippe Avouac
Constraining the variation of stress throughout the crust along fault zones and over time has importance for improving our understanding of the mechanics of faulting and estimating the hazard of distributed fault rupture and seismic ground motions.... more

Poster
TBD
Seismology Searching for Hidden Microearthquakes using Data-based, Physics-based, and Hybrid Models: Implications for Salt Dome Monitoring
Joses Omojola, Patricia Persaud, Rufus Catchings, Mark Goldman
Earthquakes in stable salt domes are few, with a notable increase in the rate of seismicity prior to catastrophic events, such as the collapse of salt caverns used to store hydrocarbons. Cavern collapse, subsequent gas leakage, and the formation of... more

Poster
TBD
Seismology Quantifying the Sensitivity of Microearthquake Slip Inversions to Station Distribution Using the LASSO Nodal Array in Oklahoma
Colin Pennington, Hilary Chang, Justin Rubinstein, Rachel Abercrombie, Nori Nakata, Takahiko Uchide, Elizabeth Cochran
To investigate the sensitivity of slip inversions to station distribution we examine three microearthquakes (M1.7, M2.1, and M2.7) that occurred within the high density LArge-n Seismic Survey in Oklahoma (LASSO) nodal array. The LASSO array’s dense... more

Talk
TBD
CXM Borehole-Derived Stress Constraints for High-Risk Fault Systems in Southern California
Patricia Persaud, Joann Stock
Several previous studies have used different stress indicators to provide constraints on crustal stress in Southern California. They noted that regional and local stress variations exist at various spatial scales and degrees of heterogeneity, and... more
20022
Talk
TBD
Geology Revisiting geologic fault slip rates - and their uncertainty - across southern California
Veronica Prush, Michael Oskin
Models of earthquake hazard rely on geologic fault slip rates to forecast future activity. With the increasing complexity of earthquake forecasting, it's crucial to apply consistent uncertainty models to the input geologic data. To date, the... more
17121, 15209
Poster
TBD
Seismology Evidence for Latent Crustal Fluid Injection Transients in Southern California From Long-Duration Earthquake Swarms
Zachary Ross, Elizabeth Cochran
Earthquake swarms are manifestations of aseismic driving processes deep in the crust. We examine the spatiotemporal distribution of aseismic processes in Southern California using a 12-years catalog of swarms derived with deep learning algorithms.... more

Talk
TBD
Geology Potentials and challenges with single-grain luminescence dating—re-evaluating our assumptions
Sourav Saha, Seulgi Moon, Nathan Brown, Ed Rhodes, Sally McGill, Katherine Scharer, Devin McPhillips
The luminescence signals in quartz grains from tectonically active regions, such as Southern California, are usually dim. This precludes us from dating single-grain quartz luminescence from these settings with the currently available technology. To... more
21100
Poster
TBD
SDOT Multifractal analysis of a seismic moment distribution obtained from InSAR inversion
Cameron Saylor, John Rundle
Interferometric synthetic-aperture radar (InSAR) interferograms are a valuable tool that can tell us about the fault systems hidden beneath the surface of the Earth. In a new approach, we fit InSAR ground deformation data using a distribution of... more

Poster
TBD
Geology Impact of fires, earthquakes, and climate on catchment response since 600 CE, Pallett Creek, San Gabriel Mountains, California USA
Katherine Scharer, Jenifer Leidelmeijer, Matthew Kirby, Nicole Bonuso, Devin McPhillips
In tectonically active regions, sedimentary records are overprinted by landscape response to climate, fire, and local earthquakes. We explore this issue using a new paleoclimate record developed at the Pallett Creek paleoseismic site in southern... more

Talk
TBD
Geology Shallow Creep Along the Central San Andreas Fault from Differential Lidar Topography
Chelsea Scott, Ramon Arrowsmith, Stephen DeLong, Michael Bunds, Nathan Toke, Manoochehr Shirzaei
Topographic differencing reveals horizontal and vertical deformation of the Earth’s surface due to fault motion. This technique has been applied to large surface rupturing earthquakes where the along- and near-fault measurements show how the shallow... more
19123, 21107
Poster
TBD
SAFS Conjugate Rupture Patterns and Role of Fluids in the 2020 Maacama Fault, California Earthquake Swarm
David Shelly, Robert Skoumal, Jeanne Hardebeck
In August of 2020, an earthquake swarm initiated near the Maacama Fault and the town of Willits, California, with magnitudes up to Mw 4.2. Although generally decreasing in intensity, the swarm persisted episodically at least into December 2020. The... more

Talk
TBD
CXM A Thermal Model of the Southern California: SoCal Likes It (Mostly) Hot
Wayne Thatcher, David Chapman
A lithospheric temperature model for Southern California is developed. Surface heat flow measurements at 237 sites are used to define 14 distinct heat flow regions where heat flow is relatively constant; the regions are chosen to conform to... more

Talk
TBD
Seismology Constraining families of dynamic models using geological, geodetic and strong ground motion data
Elisa Tinti, Emanuele Casarotti, Thomas Ulrich, Taufiq Taufiqurrahman, Duo Li, Alice-Agnes Gabriel
The dense coverage and high quality of geodetic and seismic data allow us to image intriguing details of earthquake rupture kinematics, however the mechanical viability of such models is not guaranteed. Fully dynamic models are needed to provide a... more

Poster
TBD
Seismology Initial Tests of a Bayesian Framework for Directivity and Source Spectral Analysis: Application to the July 2019 Ridgecrest Earthquake Sequence
Daniel Trugman
Earthquake source spectra can provide crucial observational constraints for understanding the physics of earthquake rupture. While there exist a number of approaches to extract key earthquake source parameters like corner frequency and stress drop... more
21017
Talk
TBD
FARM Unraveling the mechanics of multi-fault earthquakes using realistic 3D dynamic rupture models, unifying interdisciplinary geophysical observations: the 2019 Ridgecrest sequence
Thomas Ulrich, Taufiq Taufiqurrahman, Alice-Agnes Gabriel, Duo Li, Bo Li, Sara Aniko Wirp, Sara Carena, Alessandro Verdecchia, Frantisek Gallovic
The July 4 and 5, 2019, Mw6.4 and Mw7.1 Ridgecrest, California events are prominent additions to a long series of multi-fault earthquakes (such as the 1992 Landers, 2010 Haiti, 2010 El Mayor‐Cucapah, 2016 Kaikoura events), which suggest that such... more

Talk
TBD
Seismology The challenges (and solutions) of using fibre-optic cables as seismological antennas
Martijn van den Ende, Jean-Paul Ampuero
Fibre-optic Distributed Acoustic Sensing (DAS) is an emerging technology that enables the recording of ground motions with fibre-optic (telecommunication) cables. Since these cables can be deployed in environments that are traditionally challenging... more

Poster
TBD
Geodesy Strain rate mapping along the San Andreas fault system with integrated InSAR and GNSS time-series
Xiaohua Xu, David Sandwell, Emilie Klein, Yehuda Bock
Measuring crustal strain and seismic moment accumulation is crucial for understanding the growth and distribution of seismic hazards along major fault systems. In order to do that, it is important to acquire an accurate estimate of the present-day... more
20074
Talk
TBD
Geodesy Mapping faults from space with InSAR: Ridgecrest and beyond
Xiaohua Xu, David Sandwell, Lauren Ward, Chris Milliner, Bridget Smith-Konter, Peng Fang, Yehuda Bock
One of the most important objectives in tectonic geodesy is to estimate the magnitude of off-fault deformation, which relies heavily on an understanding of how strain is distributed in the crust and the ability to precisely detect mm-scale... more
19083
Poster
TBD
Seismology Effect of Porosity and Permeability Evolution on Injection-Induced Aseismic Slip
Yuyun Yang, Eric Dunham
It is widely recognized that fluid injection can trigger aseismic fault slip. However, the processes by which the fluid-rock interactions facilitate or inhibit slip are poorly understood and some are oversimplified in most models of injection-... more


The Southern California Earthquake Center is committed to providing a safe, productive, and welcoming environment for all participants. We take pride in fostering a diverse and inclusive SCEC community, and therefore expect all participants to abide by the SCEC Activities Code of Conduct.