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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.


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).

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. See the SCEC2020 Poster Session Guide for more detailed information.

Results 1-50 of 248
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SCEC ID Category Title and Authors SCEC Award
Poster 186
CXM Geomodelgrids: A storage scheme and API for multiscale Earth models
Brad Aagaard
Geomodelgrids provides a self-describing storage scheme and API for querying multiscale Earth models with the goal of standardizing storage and access of gridded community models. The storage scheme and API are agnostic to the model data values,... more

Poster 038
Seismology Does earthquake stress drop increase with depth?
Rachel Abercrombie, Daniel Trugman, Peter Shearer, Xiaowei Chen, Jiewen Zhang, Colin Pennington, Jeanne Hardebeck, Thomas Goebel, Christine Ruhl
We combine earthquake spectra from multiple studies to investigate whether the increase in stress drop with depth, that is often observed in the crust, is real or an artefact of variation in attenuation (Q) with depth. Shearer et al. [2006]... more
19163, 20097
Seismology Identifying the Moho and an intracrustal interface along a Nodal Seismic Line in the eastern San Bernardino Basin
Brian Aguilar, Patricia Persaud, Robert Clayton
We use receiver functions computed from the 2018 M 7.3 Venezuela earthquake recorded along the SB2 profile of the Basin Amplification Seismic INvestigation (BASIN) project to map the Moho discontinuity and an intracrustal interface. The SB2 profile... more
19033, 18029
Poster 189
CXM Methodology for producing hybrid Earth models with improved waveform predictions near the southern San Andreas fault and updates to SCEC UCVM API
Rasheed Ajala, Patricia Persaud, Alan Juarez
We evaluated the latest SCEC community models and hybrid versions of these embedded with hi-res basin-scale models at low frequencies utilizing medium-magnitude events not used in developing any of the models in the assessment. We benchmark the... more
20023, 19014, 18074
CXM Three definitions of ductile shear zones resulting from grain-size evolution below a frictional fault
Kali Allison, Laurent Montesi
Ductile shear zones act as the continuation of faults into the lower crust, and their structure depends in part on the faults’ frictional properties in the brittle-ductile transition (BDT) region. We explore how fault and ductile shear zone... more
Poster 148
FARM Viscoelastic earthquake sequence simulations in complex geometries
Martin Almquist, Eric Dunham
Earthquake sequence simulations are used to study earthquake source processes, relate fault slip to observable ground motions and crustal deformation, and set initial stresses for dynamic rupture simulations. Most previous earthquake sequence... more
GM A new model to explain the frequency-dependent decay of Fourier acceleration spectra at high frequencies
John Anderson, Annabel Haendel, Marco Pilz, Fabrice Cotton
Fourier amplitudes of acceleration rapidly decrease at high frequencies beyond the source corner frequency. This spectral decay is commonly modeled by a single parameter kappa introduced by Anderson and Hough (1984), which we will call the „kappa... more

Poster 132
FARM Creating a multi-proxy approach to robustly capture earthquake temperature rise at the Punchbowl fault
Emma Armstrong, Alexis Ault, Kelly Bradbury, Heather Savage, Pratigya Polissar
During an earthquake, friction-generated heat occurs along localized fault surfaces. However, coseismic temperature rise, critical for identifying past earthquakes, is difficult to accurately quantify in the rock record. To address this issue, we... more
Poster 197
GM Deterministic ground motion simulations with shallow crust nonlinearity
Domniki Asimaki, Elnaz Seylabi, Doriam Restrepo, Ricardo Taborda
We perform a series of large-scale nonlinear ground motion simulations that account for the cyclic plastic behavior of sediments in the shallow crust. Our goal is to understand and quantitatively assess (1) how idealized models of sediment... more
18020, 19056
EEII Implementation of Monte-Carlo earthquake catalogs in probabilistic seismic hazard analysis: An application to CyberShake
Sarah Azar, Mayssa Dabaghi
Conventional Probabilistic Seismic Hazard Analysis (PSHA) employs ground motion prediction equations (GMPEs) as ground motion models. However, alternative methods such as numerical simulations can also be used in predicting the intensity of a ground... more

Poster 229
EEII Selection of CyberShake Simulated Ground Motion Time Series for Engineering Analysis
Jack Baker, Sanaz Rezaeian, Christine Goulet, Nicolas Luco, Ganyu Teng
This presentation will describe a subset of CyberShake numerically simulated ground motions that were selected and vetted for use in engineering response history analyses. CyberShake is a Southern California Earthquake Center (SCEC) high-performance... more
Seismology Stress drop and ground-motion source comparison of the July 2019 Ridgecrest earthquake sequence: A community validation study
Annemarie Baltay, Rachel Abercrombie
We propose a community stress drop validation study using the 2019 Ridgecrest earthquake sequence as a common data set. Earthquake stress drops are notoriously variable and attempts to correlate estimates of the same earthquake using different... more

FARM Investigation of transient and hysteretic flash-weakening behavior observed in high-speed friction experiments
Monica Barbery, Frederick Chester, Judith Chester
Friction, µ, during seismic slip reflects deformation over a range of length-scales, but fundamentally arises from physical and chemical processes operating at µm-scale contact junctions. In past SCEC research we documented inhomogeneous flash-... more
Poster 147
FARM Excitation of San Andreas tremors by thermal instabilities below the seismogenic zone
Sylvain Barbot, Lifeng Wang
The relative motion of tectonic plates is accommodated at boundary faults through slow and fast ruptures that encompass a wide range of source properties. Near the Parkfield segment of the San Andreas fault, deep low-frequency earthquakes and slow-... more

Poster 221
GM Region-specific Fourier-based site amplification modeling
Jeff Bayless, Jonathan Stewart
This SCEC study addresses the need for improved nonlinear site amplification models on the SCEC BBP. We infer site response in northern and southern California from earthquake recordings and develop appropriate models for frequency-dependent... more
Poster 129
FARM Small Magnitude Seismicity Helps Identify Transient Signals of Fault Creep on the North Anatolian Fault in Noisy GPS Recordings
Eric Beauce, Michel Campillo, Rob van der Hilst
The North Anatolian Fault (NAF), a major continental plate boundary, accommodates the motion between Eurasia and Anatolia with right-lateral strike-slip motion. Shallow aseismic slip has first been identified on the Ismetpasa segment of the NAF in... more

Poster 173
CXM Joint MCMC Inversion of Rayleigh Wave Phase Velocity, Ellipticity, and Receiver Functions: Southern California Shear Velocity Model Expanding to the Shallower and Deeper Crust
Elizabeth Berg, Fan-Chi Lin, Vera Schulte-Pelkum, Konstantinos Gkogkas, Hongrui Qiu
We provide a new isotropic shear velocity model of Southern California with sensitivity from the near-surface into the upper mantle, including resolving Moho depths. We accomplish this through Bayesian joint inversion of Rayleigh wave phase... more
EFP Maximum Entropy Modeling of Earthquake Recurrence from Paleoseismic Event Time Series
Glenn Biasi, Fred Bookstein
Conditional probability estimates of a ground rupturing earthquake depend heavily upon something we do not know: the shape of the recurrence model distribution. We present a new recurrence model approach based on information theory and entropy... more

Poster 121
SDOT Restoring California, part I: 0-18 Ma
Peter Bird, Raymond Ingersoll
We are computing incremental stepwise restorations of maps of faults and outcrops in the western United States and northern Mexico using kinematic F-E program RESTORE (v.4) and datasets of: fault traces, fault offsets, timing constraints,... more

Poster 171
CXM Comparison of ground motions in earthquakes with SCEC CVM predictions
Brianna Birkel, John Vidale, Alan Juarez, Thomas Jordan
Southern California, and particularly the Los Angeles region, contains strongly heterogeneous crustal structures that have been carefully studied, mapped, and integrated into the SCEC Community Velocity Models (CVMs). Although the CVMs of Southern... more
Poster 152
FARM Numerical simulations of dynamic earthquake rupture with different failure laws
Ekaterina Bolotskaya, Bradford Hager
Geodetic and seismic observations indicate that most earthquakes result from unstable shear on quasi-planar faults, usually represented as shear cracks. Multiple failure laws have been proposed to describe fracture- and friction- related processes... more

Poster 209
GM Detailed space-time variations of shallow velocity changes from dense array data
Luis Bonilla, Yehuda Ben-Zion
We compute high resolution space-time variations of subsurface seismic properties from autocorrelation functions (ACF) of noise and local earthquakes recorded at the Sage Brush Flat dense array, deployed around the Clark branch of the San Jacinto... more
Poster 061
Seismology The Nevada Seismological Laboratory’s 2020 M6.5 Monte Cristo Range, Nevada earthquake sequence rapid seismic deployment and data availability
Jayne Bormann, Emily Morton, Ken Smith, Graham Kent, Will Honjas, Gabe Plank
The Nevada Seismological Laboratory (NSL) installed 8 temporary seismic stations following the 15 May 2020 Mw 6.5 Monte Cristo Range (MCR) earthquake. The mainshock and resulting aftershock sequence occurred in an unpopulated and sparely... more

Poster 066
Seismology Temporal Seismic Velocity Variations: Recovery Following from the 2019 Mw 7.1 Ridgecrest Earthquake
Joshua Boschelli, Morgan Moschetti, Christoph Sens-Schönfelder
We investigated seismic velocity changes (dv/v) associated with the 2019 Ridgecrest earthquake sequence from high-frequency autocorrelations of ambient seismic noise data. Daily autocorrelation functions were computed for the entirety of 2019 for... more

EFP Lessons in earthquake nucleation drawn from subduction zones and ice streams
Emily Brodsky
The 2014 M8.1 Iquique earthquake and the 2011 M9.0 Tohoku earthquake have provided the most promising evidence to date that a slow precursory slip may exist before at least some earthquakes. These apparent precursors are observable because they are... more

Poster 027
SAFS High Resolution Topography along 40 km of the Southern San Andreas Fault
Michael Bunds, Chelsea Scott, Jui-Chi Lee, Brigham Whitney
We produced a point cloud, digital surface model (DSM), and orthomosaic that cover ~ 40.5 km of strike length and ~31 km^2 area along the Southern San Andreas fault using small uncrewed areal system (sUAS) photographs and dGNSS camera positioning.... more
Geology Resolving the late Quaternary slip rate of the Santa Susana fault with in situ cosmogenic 36Cl profile dating
Reed Burgette, Michael Reed, Nathaniel Lifton, Katherine Scharer, Devin McPhillips, Ronny Sholdt
The Santa Susana fault (SSF) is a significant reverse fault in the western Transverse Ranges that connects structures bounding the Ventura and San Fernando basins. Based on published studies, the SSF is permitted a negligible to significant (0.5-10... more
Poster 191
CS Enhancing CyberShake simulations for engineering applications
Scott Callaghan, Philip Maechling, Christine Goulet, Kevin Milner, Robert Graves, Kim Olsen, Fabio Silva, Yehuda Ben-Zion
SCEC has developed the CyberShake platform to implement a physics-based probabilistic seismic hazard analysis (PSHA) method which uses 3D wave propagation simulations to calculate seismograms and ground motions from sources defined in regional... more

Poster 033
Seismology A method for jointly measuring multi-mode surface wave phase velocities from one-component dense seismic arrays: A case study in Long Beach, California
Jorge Castellanos, Robert Clayton
In this study, we use ambient noise data recorded at stations of the Southern California Seismic Network and three dense petroleum industry surveys to show the occurrence of surface wave mode interference and prove that, if not properly accounted... more

Seismology Results from dense nodal-array recordings of the 2019 Ridgecrest Sequence aftershocks
Rufus Catchings, Mark Goldman, Malcolm White, Hongrui Qiu, Yehuda Ben-Zion
The 2019 Ridgecrest, California earthquake sequence included Mw 6.4 and Mw 7.1 events on orthogonal faults, with tens of thousands of ensuing aftershocks. We recorded aftershocks and ambient noise for a 2-month period following the mainshock to: (1... more

Poster 106
Geodesy Permanent Co-seismic Deformation of the 2013 Mw7.7 Baluchistan, Pakistan Earthquake from High-resolution Surface Strain Analysis
Guo Cheng, William Barnhart
Earthquake-generating faults are commonly surrounded by features such as topography and damage zones that indicate that earthquakes induce some degrees of permanent (inelastic) deformation. Quantifying the magnitude and extent of co-seismic... more

Poster 065
Seismology Variations of earthquake properties before, during and after the 2019 M7.1 Ridgecrest, CA, earthquake
Yifang Cheng, Yehuda Ben-Zion
We attempt to clarify processes associated with the 2019 Ridgecrest earthquake sequence by analyzing space-time variations of seismicity, potency values and focal mechanisms of earthquakes leading to and during the sequence. Over the 20 years before... more
Poster 174
CXM An automated workflow for adjoint tomography applied to the North Island, New Zealand
Bryant Chow, Yoshihiro Kaneko, Carl Tape, Ryan Modrak, John Townend
We have developed an automated, open-source workflow for full-waveform inversion using spectral-element and adjoint methods (Chow et al., 2020). Our main objective is to attain high-resolution images of crustal structure and complex tectonic... more

Poster 193
CS Cloud-Native Analysis of Southern California Waveform Data
Tim Clements, Julian Schmitt, Marine Denolle
Cloud computing offers a paradigm shift for data-heavy seismic analysis by bringing computation to data rather than data to computation. Southern California is the ideal testing ground for cloud-native analyses, as the entire archive of waveform... more

Seismology Varied Fault Orientations in a Uniform Stress Field: The 2011 M5.7 Prague Earthquake Sequence
Elizabeth Cochran, Rob Skoumal, Devin McPhillips, Zachary Ross, Kathleen Keranen
The role of pore pressure changes in induced earthquake sequences can be inferred by the set of faults activated relative to the local stress orientations. Here, we examine the 2011 M5.7 Prague earthquake sequence that was induced by nearby... more

Seismology Stress analysis and rupture dynamics of the 2019 Ridgecrest Sequence
Jordan Cortez, David Oglesby, Christodoulos Kyriakopoulos, Baoning Wu, Abhijit Ghosh, Roby Douilly
Stress transfer from long-term loading as well as prior earthquakes can initiate seismic triggering and strongly affect rupture propagation and slip patterns in a fault system. A prime example of this effect is the 2019 Ridgecrest earthquake... more

Poster 167
FARM Unraveling scaling properties of slow slip events in 3D simulations of fault slip
Luca Dal Zilio, Nadia Lapusta, Jean-Philippe Avouac
Large megathrust faults produce a wide spectrum of slip modes, ranging from earthquakes to slow-slip events (SSEs). SSEs appear to have slip mechanisms similar to those of regular (fast) earthquakes and are often located in neighboring regions of... more

CS Advancing earthquake science with robotics and AI
Jnaneshwar Das, Ramon Arrowsmith, Zhiang Chen, Tyler Scott, Chelsea Scott, Devin Keating
Unprecedented progress in AI in recent years has improved data-driven discovery in the earthquake sciences. Together, we envision robotics and AI to advance earthquake science through improved automation and reduced cognitive burden on scientists,... more
19179, 20129
Poster 086
EFP Two Foreshock Sequences Post Gulia and Wiemer (2019)
Kelian Dascher-Cousineau, Emily Brodsky, Thorne Lay
Recognizing earthquakes as foreshocks in real time would provide a valuable forecasting capability. In a recent study, Gulia and Wiemer (2019) proposed a traffic‐light system that relies on abrupt changes in b‐values relative to background values.... more

Poster 001
Geology Late-Quaternary slip rates along the plate boundary Magallanes Fault System, Patagonia
Gregory De Pascale, Francisca Sandoval, Manuel Hernandez
The megathrust plate boundary in Chile (responsible for the 1960 Mw 9.5 Valdivia Earthquake) dominates the seismic hazard discussion, strike slip faults play a major role in the neotectonic framework in Central-Southern Chile (including Patagonia)... more

Poster 134
FARM Developing a Database for the Fragile Geologic Features at the Trona Pinnacles National Monument
Savannah Devine, Xiaofeng Meng, Christine Goulet, Andrea Donnellan, Devin McPhillips, Gregory Lyzenga
In places where recording instruments are not available, the damage state of fragile geologic features (FGFs), combined with appropriate analyses techniques, can be utilized to estimate the ground shaking from earthquakes. We propose to aggregate... more

Poster 137
FARM Evidence for slow slip in Mecca Hills, CA, from microstructural and (U-Th)/He analysis of heterogeneous hematite coatings on shallow fault surfaces
Alexandra DiMonte, Alexis Ault, Kelly Bradbury, Greg Hirth
Geodetic and seismologic studies reveal slow slip events in the shallow portions of faults, but the influence of rheology on these events is poorly constrained. Outcrop to nanoscale structures and mineral textures observed in exhumed faults record... more

Poster 004
Geology Late Pleistocene slip rate and 3D geometry of the Mid-Channel blind thrust, Santa Barbara Channel, CA, and their implications for earthquake hazards
Jessica Don, John Shaw, Ana Luiza Nicolae, Christopher Sorlien, Craig Nicholson, Richard Behl
The offshore Mid-Channel blind-thrust fault is located in the Santa Barbara Channel in the southern portion of the western Transverse Ranges. The fault is north dipping and overlain by an asymmetric anticline with a narrow steep forelimb and a wider... more
FARM Database Development for the Trona Pinnacles Fragile Geologic Features
Andrea Donnellan, Christine Goulet, Xiaofeng Meng, Gregory Lyzenga, Devin McPhillips, Savannah Devine
The 2019 Ridgecrest earthquake sequence, which included M6.4 and M7.1 earthquakes on orthogonal fault ruptures, occurred near the Trona Pinnacles. The Tona Pinnacles consist of more than 500 tufa spires located in the Searles Lake Basin, some of... more
Geodesy Comparison of ground-based and space-based surface rupture mapping of the May 15, 2020 M6.5 Monte Cristo Range earthquake, Nevada
Austin Elliott, Seth Dee, Rich Koehler, William Barnhart, Rich Briggs, Camille Collett, Timothy Dawson, Stephen DeLong, Ryan Gold, Elizabeth Haddon, Evan Hartsorn, Alexandra Hatem, Chris Milliner, Alexandra Pickering, Ian Pierce, Gordon Seitz, Charles Trexler, Chuck Wicks, Xiaohua Xu, Judy Zachariasen
The M6.5 Monte Cristo Range, Nevada earthquake of May 15, 2020 ruptured an intricate array of small faults at the Earth’s surface, most too small to map individually with satellite imaging, and with small offsets that were difficult to detect and... more

Poster 096
EFP Foreshock Cascade to Failure in the M 6.4 July 4, 2019 Ridgecrest, California Earthquake
William Ellsworth
Our current understanding of how earthquakes nucleate leaves open critical questions about the physical processes that occur before dynamic rupture including whether or not foreshocks have other than weak statistical value as a precursor. Two end-... more

Poster 120
SDOT An innovative technique combining forward and inverse approaches to resolve interseismic deep slip and locking depths on closely spaced faults
Hanna Elston, Michele Cooke, Jack Loveless, Scott Marshall
In the San Gorgonio Pass region, forward Boundary Element Method (BEM) models of complex 3D faulting show that multiple viable fault configurations can match some but not all geologic slip rates. Inversions of interseismic surface velocities often... more
Poster 166
FARM Community Code Comparisons for Simulating Sequences of Earthquakes and Aseismic Slip (SEAS): Exploring Full dynamics and 3D Effects
Brittany Erickson, Junle Jiang, Michael Barall, Mohamed Abdelmeguid, Lauren Abrahams, Kali Allison, Jean-Paul Ampuero, Sylvain Barbot, Camilla Cattania, Benchun Duan, Eric Dunham, Ahmed Elbanna, Yuri Fialko, Ruth Harris, Benjamin Idini, Jeremy Kozdon, Valere Lambert, Nadia Lapusta, Meng Li, Dunyu Liu, Yajing Liu, Yingdi Luo, Xiao Ma, Casper Pranger, Paul Segall, Pengcheng Shi, Prithvi Thakur, Martijn van den Ende, Ylona van Dinther, Meng Wei
Numerical simulations of Sequences of Earthquakes and Aseismic Slip (SEAS) have made great progress over past decades to address important questions in earthquake physics and fault mechanics. However, significant challenges in SEAS modeling remain... more
Poster 083
Seismology Monitoring the changing site response of the Mexico City basin
Laura Ermert, Marine Denolle
Many large cities are built on sedimentary basins, and considerable effort has been dedicated to study the specific seismic hazard associated with their particular geometries and lithologies. Recently, there is growing recognition of the evolving... more

Poster 113
Geodesy Exploratory visualization and analysis of high resolution GPS data across California
Ariel Espindola-Mercado, Amy Ferrick, Brendan Meade
As part of the 2020 SOURCES program our team forayed into the Nevada Geodetic Laboratory’s high frequency 5-minute GPS dataset spanning 2013-2017. This dataset, over 350 GB and 20 million separate files, has remained underutilized and difficult to... 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.