PROGRAM | TRAVEL | REGISTRATION | ABSTRACTS | PARTICIPANTS |
Meeting Abstracts
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 form below to search and view all poster and invited talk abstracts submitted to this meeting.
SCEC ID ▲ | Category | Title and Authors | SCEC Award |
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Poster 051 |
Seismology |
Anomalously large complete stress drop during the 2016 Mw 5.2 Borrego Springs earthquake inferred by waveform modeling and near-source aftershock deficit
Zachary Ross, Hiroo Kanamori, Egill Hauksson The 2016 Mw 5.2 Borrego Springs earthquake occurred in the trifurcation area of the San Jacinto fault zone and generated more than 23,000 aftershocks. We analyze source properties of this earthquake along with 12,487 precisely located aftershock... more |
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Poster 052 |
Seismology |
Directly Estimating Rupture Area to Remove the Uncertainty in Stress Drop
Jeff McGuire, Yoshihiro Kaneko The key kinematic earthquake source parameters: rupture velocity, duration and area, shed light on earthquake dynamics. They can provide direct constraints on stress drop and have implications for seismic hazard. However, for moderate and small... more |
16104
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Poster 053 |
Seismology |
Towards quasi-automated estimates of directivity and related source properties of small to moderate earthquakes with second seismic moments
Haoran Meng, Yehuda Ben-Zion, Jeff McGuire We develop a method for quasi-automated estimation of directivity, rupture area, duration, and centroid velocity of earthquakes with second seismic moments. The method is applied to small to moderate earthquakes in southern California. P and S phase... more |
17177
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Poster 054 |
Seismology |
Testing and Reconciling Stress Drop and Attenuation Models for Southern California
Peter Shearer, Rachel Abercrombie, Daniel Trugman Earthquake stress drop is a fundamental source parameter, implicit in many SCEC science goals. It is relatively easy to estimate from seismic data, but hard to measure reliably. The large uncertainties and scatter in results affect strong ground... more |
16020
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Poster 055 |
Seismology |
Proposed Community Stress Drop Validation Experiment
Annemarie Baltay, William Ellsworth, Martin Schoenball, Gregory Beroza We propose to undertake a rigorous community stress drop validation study, and present here a draft “experimental design” for community review and feedback.
Earthquake stress drops are notoriously variable and difficult to measure; as such,... more |
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Poster 056 |
Seismology |
Detailed observations of seismicity, stress drop and directivity on a complex fault structure in Mogul Nevada
Rachel Abercrombie, Christine Ruhl, Ken Smith The exceptionally well-recorded Mogul earthquake sequence, near Reno NV in 2008 allows detailed investigation of seismicity migration, and propagation through complex structures. Following two months of swarm-like earthquakes an increase in both... more |
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Poster 057 |
Seismology |
Preliminary insights into the fault geometry and rupture history of the 2016 Mw 7.8 Kaikoura, New Zealand, earthquake
Mareike Adams, Chen Ji The November 14th 2016 MW 7.8 Kaikoura, New Zealand earthquake occurred along the east coast of the northern part of the South Island. The local tectonic setting is complicated. The central South Island is dominated by oblique continental... more |
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Poster 058 |
Seismology |
Analysis of Two Magnitude ~4 Earthquakes and Aftershocks Near Truckee, California, 2017
Rachel Hatch, Ken Smith, Rachel Abercrombie On June 27th, 2017, two magnitude ~4 high-angle strike-slip faulting earthquakes occurred seven minutes apart approximately 20 km north of Truckee, CA. Both events were felt over a wide area in northeastern California and northwestern Nevada. The... more |
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Poster 059 |
Seismology |
Thermomechanical earthquake cycle simulations with rate-and-state friction and nonlinear viscoelasticity
Kali Allison, Eric Dunham We simulate earthquake cycles on a 2D strike-slip fault, modeling both rate-and-state fault friction and an off-fault nonlinear power-law rheology. The power-law rheology involves an effective viscosity that is a function of temperature and stress,... more |
7272
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Poster 060 |
Seismology |
Reconciling Fault Geometry in Nepal Himalaya using the “NAMASTE” Seismic Network
Manuel Mendoza, Abhijit Ghosh, Marianne Karplus, John Nabelek, Soma Sapkota, Lok Adhikari, Simon Klemperer, Aaron Velasco The Mw 7.8 Gorkha earthquake in April of 2015 produced ~8 m of peak co-seismic slip as the Main Himalayan Thrust (MHT) fault ruptured 130 km east, under dense population centers such as Kathmandu. The mainshock and subsequent aftershocks killed over... more |
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Poster 061 |
Seismology |
Frequency-Dependent Tidal Triggering of Low Frequency Earthquakes Near Parkfield, California
Lian Xue, Roland Bürgmann, David Shelly The effect of small periodic stress perturbations on earthquake generation in most cases is not clear. However, the rate of low-frequency earthquakes (LFEs) near Parkfield, California has been found to be strongly correlated with solid earth tides.... more |
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Poster 062 |
Seismology |
Dynamic triggering of earthquakes north of Xiaojiang Fault, Yunnan
Yuexin Li, Roland Bürgmann, Hongfeng Yang, Shiyong Zhou Dynamic triggering is a ubiquitous phenomenon that has been well-documented all around the world. Most dynamic triggering cases are observed through visually inspecting their spectrograms and seismic records, and the triggered earthquakes are... more |
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Poster 063 |
Seismology |
What does an 'average' large subduction earthquake look like?
Men-Andrin Meier, Jean-Paul Ampuero, Thomas Heaton When we study individual earthquakes we often notice and report 'peculiarities', or unexpected rupture behavior. This implies that there is a 'normal' or average earthquake behavior from which such events deviate. From an... more |
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Poster 064 |
Seismology |
Large-scale Acceleration of Slow Slip Before the 2015 Mw 8.4 Illapel, Chile Earthquake
Hui Huang, Lingsen Meng Foreshocks and/or slow slip were observed to accelerate before some recent large earthquakes, e.g., the 2011 M 9.0 Tohoku-Oki and the 2014 M 8.2 Iquique earthquake. However, it is still controversial regarding the universality of precursory signals... more |
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Poster 065 |
Seismology |
Seismicity and tectonic tremor associated with shallow offshore slow slip along the northern Hikurangi Margin, New Zealand
Erin Todd Shallow (<15 km) slow slip events have been well documented offshore Gisborne on the northern Hikurangi Margin, New Zealand for over a decade. Gisborne slow slip events are associated with tectonic tremor downdip of the slow slip patch and... more |
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Poster 066 |
Seismology |
Continuous Tremor in the Alaska-Aleutian Subduction Zone Detected by Aleutian Array of Arrays
Bo Li, Abhijit Ghosh, Clifford Thurber, Federica Lanza Previous studies show tremor activities represent slips on small asperities due to slow slip in the surrounding region [e.g., Bartlow et al, 2011; Ghosh et al., 2012]. Therefore, their spatiotemporal distribution, migration directions, patterns and... more |
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Poster 067 |
Seismology |
Ambient tectonic tremor in the San Jacinto Fault
Alexandra Hutchison, Abhijit Ghosh Multiple, discrete instances of ambient tectonic tremor were detected in the Anza Seismic Gap section of the San Jacinto Fault (SJF) during June 2011 using both high-density arrays and a variety of network stations. These events were detected,... more |
15164
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Poster 068 |
Seismology |
Systematic Search for Repeating Earthquakes along the Central San Jacinto Fault
Dongdong Yao, Zhigang Peng, Clara Daniels, Xiaofeng Meng Microearthquakes are much more abundant along the San Jacinto Fault (SJF) when compared to the nearby South San Andreas Fault (SAF), although their slip rates are somewhat similar. Many studies proposed that “brittle creep” could explain the... more |
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Poster 069 |
Seismology |
Repeating earthquakes detected by a new fast method reveal complex creep behavior in the northern San Francisco Bay Area
Nader Shakibay Senobari, Gareth Funning Repeating earthquakes (REs) are families of seismic events generated by repeated loading and failure of a single fault asperity. They produce similar waveforms at common seismic stations, that can be identified by similarity search. Sequences of REs... more |
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Poster 070 |
Seismology |
Linking seismicity and fault surface properties
Magali Barba, Kristy Tiampo, Margaret Glasscoe Recent work linking asperities and seismicity suggests that changing the spatial configuration of asperities or increasing the total number of asperities can generate a greater number of larger events (Kazemian et al., 2013). The expansion of... more |
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Poster 071 |
Seismology |
Tectonic tremor in San Andreas Fault near Cholame captured by a mini seismic array
Kuntal Chaudhuri, Abhijit Ghosh The San Andreas Fault, a right lateral strike slip fault, is one of the most well-studied faults on the planet earth. However, our understanding of slow earthquakes, tremor and its relationship with regular earthquakes remains poor. Many studies... more |
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Poster 072 |
Seismology |
A detailed, automatically-derived, seismicity catalog for the San Jacinto fault zone (1998-2016)
Malcolm White, Zachary Ross, Yehuda Ben-Zion, Frank Vernon Earthquake catalogs of provide foundational datasets for numerous studies on earthquake physics, dynamics of seismicity, fault structure at depth, tomography, stress inversions and seismic hazard analysis. The San Jacinto fault zone is the most... more |
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Poster 073 |
Seismology |
An Improved Method to Determine Coda-Q, Earthquake Magnitude, and Site Amplification: Theory and Application to Southern California
Wei Wang, Peter Shearer The wavetrain following direct P and S is called the coda and is caused by scattered energy. Coda waves play an important role in seismology for measuring the attenuation of media, earthquake magnitude, and site amplification. We have developed an... more |
G15AP00094
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Poster 074 |
Seismology |
Earthquake Monitoring with the MyShake Global Smartphone Seismic Network
Asaf Inbal, Qingkai Kong, Richard Allen, William Savran Smartphone arrays have the potential for significantly improving seismic monitoring in sparsely instrumented urban areas. This approach benefits from the dense spatial coverage of users, as well as from communication and computational capabilities... more |
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Poster 075 |
Seismology |
Depth Distribution of the 2010 El Mayor-Cucapah Earthquake Sequence (M>=4) Determined from Regional Waveform Modeling
Chunquan Yu, Egill Hauksson, Zhongwen Zhan, Elizabeth Cochran The 2010 Mw 7.2 El Mayor-Cucapah earthquake ruptured bilaterally over a zone of about 120 km in length. The rupture terminates near the US-Mexico international border in the northwest and near the northern tip of the Gulf of California in the... more |
Y86581
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Poster 076 |
Seismology |
Implementing rapid, probabilistic association of earthquakes with source faults in the CFM for southern California
Walker Evans, Andreas Plesch, Won Lee, Natesh Pillai, John Shaw, Men-Andrin Meier, Egill Hauksson We present a statistical method to identify the fault (or sets of candidate faults) that generated an earthquake using information provided soon after these events occur. This effort bridges the information provided by increasingly sophisticated... more |
17026
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Poster 077 | Seismology |
Obspy, Web Services and Big Data – Using the Southern California Earthquake Data Center (SCEDC) and the Southern California Seismic Network (SCSN) Products and Services for Earthquake Research
Ellen Yu, Prabha Acharya, Aparna Bhaskaran, Shang-Lin Chen, Jennifer Andrews, Valerie Thomas, Egill Hauksson, Robert Clayton The SCEDC archives continuous data from 10,578 data channels and 528 SCSN recorded stations in near real time. The SCEDC processes and archives an average of 16,000 earthquakes each year, forming an earthquake catalog dating back to 1932. The SCEDC... more |
17089
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Poster 078 |
Seismology |
A 15-year catalog of more than 1 million low-frequency earthquakes: tracking tremor and slip along the deep San Andreas Fault
David Shelly Low-frequency earthquakes (LFEs) are small, rapidly recurring slip events that occur on the deep extensions of some major faults. Their collective activation is often observed as a semi-continuous signal known as tectonic (or non-volcanic) tremor... more |
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Poster 079 |
Seismology |
Natural Time and Earthquake Aftershock Entropy
Alexis Giguere Driven threshold systems are characterized by cascading events or bursts that tend to be strongly clustered in linear (clock) time. As a result, a useful framework to analyze these events is the concept of event count, or “natural time”. For... more |
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Poster 080 | Seismology |
Toward a more robust tsunami early warning system: integration of real-time GPS, strong motion and teleseismic data for fast seismic source inversion
Kejie Chen, Zhen Liu, Tony Song Compared with seismometers, GPS receivers record co-seismic displacements directly without saturation, which is particularly sensitive to characterize mega tsunamigenic earthquakes and especially important for tsunami early warning. As a result, the... more |
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Poster 081 |
Seismology |
Rapid Line-Source and Ground-Motion Estimates for Earthquake Early Warning Using FinDer Version 2
Maren Böse, Deborah Smith, Claude Felizardo, Men-Andrin Meier, Thomas Heaton, John Clinton Characterizing earthquakes in real-time, for applications like earthquake early warning, requires a flexible modeling approach that can accommodate a small earthquake becoming large as fault rupture evolves over time. Hence, we present a modeling... more |
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Poster 082 |
Seismology |
The seismological aftermath of the 2016 Mw7.8 Pedernales, Ecuador earthquake
Stephen Hernandez On 16 April 2016, a strong underthrusting earthquake ruptured a ~100 by ~50 km segment of the Nazca-South American margin off the coast of the province of Manabí, Ecuador. Effects of the earthquake included >660 fatalities, a small tsunami,... more |
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Poster 083 |
Seismology |
How NSHMP 2014 and UCERF3 have changed the earthquake risk landscape in the US
Marleen Nyst, Delphine Fitzenz, Nilesh Shome Early 2017 RMS released an updated North America Earthquake Model to the insurance market with risk models for the US, Canada and Mexico. Here we will focus on California, the Pacific Northwest (PNW) and New Madrid. This new model has updates for... more |
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Poster 084 |
Seismology |
Path and site effects in GMPEs: Incorporating crustal physical properties for region-specific ground motion estimation using small magnitude data from Southern California
Valerie Sahakian, Annemarie Baltay, Tom Hanks, Janine Buehler, Frank Vernon The purpose of this work is to reduce aleatory uncertainty in ground motion prediction equations (GMPEs) by including knowable, physical processes or properties of path effects; in effect, reclassifying this uncertainty as epistemic, and improving... more |
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Poster 085 |
Seismology |
Complex Rayleigh Wave Effects on the Seismic Demands of Mid-Rise Buildings
Jorge Castillo Castellanos, Monica Kohler, Anthony Massari, Robert Clayton Observations of earthquake motions recorded by spatially dense seismic arrays in buildings located in the northern Los Angeles basin suggest the presence of complex, amplified surface wave effects on the seismic demand of mid-rise buildings. Several... more |
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Poster 086 |
Geodesy |
Off-fault deformations and shallow slip deficit from dynamic rupture simulations with fault zone plasticity
Daniel Roten, Kim Olsen, Steven Day Fault slip distributions obtained from source inversions of major (M > 7) strike-slip earthquakes (e.g., M 7.3 Landers, M 7.1 Hector Mine, M 7.6 Izmit, M 6.5 Bam, M 7.2 Baja California) indicate that coseismic slip near the surface is... more |
16238
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Poster 087 |
Geodesy |
Can deformation rates across the Carrizo Plain segment of the San Andreas Fault be explained by vertical migration of the locked to-creeping transition?
Lucile Bruhat, Paul Segall Most geodetic inversions of surface deformation rates consider the depth distribution of interseismic fault slip-rate to be time invariant. However, some numerical simulations show down-dip penetration of dynamic rupture into regions with velocity-... more |
17136
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Poster 088 |
Geodesy |
Creep avalanches on San Andreas Fault and their underlying mechanism from 19 years of InSAR and seismicity
Mostafa Khoshmanesh, Manoochehr Shirzaei Recent seismic and geodetic observations indicate that interseismic creep rate varies in both time and space. The spatial extent of creep determines the earthquake potential, while its temporal evolution, known as slow slip events (SSE), may trigger... more |
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Poster 089 |
Geodesy |
A 4-D Earthquake Cycle Model with Lateral Variations in Shear Modulus
David Sandwell, Bridget Smith-Konter We have developed a semi-analytic approach (and computational code) for rapidly calculating 3D time-dependent deformation and stress caused by screw dislocations imbedded within an elastic layer overlying a Maxwell viscoelastic half space. The... more |
17042, 17169
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Poster 090 |
Geodesy |
The impact of model prediction error in designing geodetic networks for crustal deformation applications
Jessica Murray Earth surface displacements measured at Global Navigation Satellite System (GNSS) sites record crustal deformation due, for example, to slip on faults underground. A primary objective in designing geodetic networks to study crustal deformation is... more |
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Poster 091 |
Geodesy |
Production and Uses of Multi-Decade Geodetic Earth Science Data Records
Sharon Kedar, Yehuda Bock, Angelyn Moore, Peng Fang, Anne sullivan, Donald Argus, Songnian Jiang, Scott Marshall The Solid Earth Science ESDR System (SESES) project funded under the NASA MEaSUREs program produces and disseminates mature, long-term, calibrated and validated, GNSS based Earth Science Data Records (ESDRs) that encompass multiple diverse areas of... more |
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Poster 092 |
Geodesy |
Red Geodesica del Noroeste de Mexico (REGNOM) in northern Baja California.
Alejandro Gonzalez-Ortega, Antonio Vidal-Villegas, Elvia Ramon Morales, Armando Valdez, Sergio Arregui Ojeda Permanent continuous GPS stations in Baja California started to operate since 1995 as part of the Southern California Integrated GPS Network (SCIGN). Due to the occurrence of the El Mayor-Cucapah earthquake Mw 7.2 in April 4, 2010, colleagues from... more |
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Poster 093 |
Geodesy |
USGS Global Positioning System (GPS) Network in Southern California
Daniel Determan, Aris Aspiotes, Christian Guillemot, John Langbein, Mark Murray, Marcos Alvarez, Keith Stark The USGS Pasadena office operates 141 permanent, continuously-operating GPS monitoring stations as part of the Southern California GPS Network (SCGN). The SCGN network has grown and modernized over the years with the help of American Recovery and... more |
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Poster 094 |
Geodesy |
On the Geodetic Signature from Lake Mead Water Levels Fluctuations (1940-2016)
Debi Kilb, Adrian Borsa, Duncan Agnew Large load changes due to fluctuations in surface water repositories (i.e., reservoirs and lakes) can result in a solid earth response that is observable in GPS surface displacements. The spatial distribution of the resulting earth response to these... more |
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Poster 095 |
Geodesy |
The Far-Field Effect of Large Earthquakes in GPS Time-Series
Zachary Young, Corné Kreemer The proper identification of earthquake-related offsets in GPS time-series is important, not only to characterize the earthquake and the elastic medium, but also because other parameters, most notably the rate, may be biased when offsets are not... more |
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Poster 096 |
Geodesy |
Seismogenic structure and coseismic slip distribution of the 2013 Ms7.0 Lushan earthquake in southwestern China
Qi Liu, Xueze Wen, Zhigang Shao To further understand the tectonic process of the Lushan MS7.0 earthquake, which occurred in southwestern China on April 20, 2013, a 3D fault geometry model was built by integrating the relocated aftershocks distribution and the information of... more |
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Poster 097 |
Geodesy |
A study of the December 2016, The Geysers, CA earthquake using InSAR and GPS
Rachel Terry, Gareth Funning, Michael Floyd The Geysers geothermal field in northern California, the largest of its kind in the world, has historically sustained high seismicity rates, connected to the production of steam from the over 400 geothermal wells in the area. In addition, the... more |
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Poster 098 |
Geodesy |
A Systematic Study of Earthquake Detectability Using Sentinel-1 TOPS InSAR
Gareth Funning, Astrid Garcia We report on our efforts to study global seismicity with Sentinel-1 TOPS data between April 2015 and December 2016. We searched the USGS/NEIC earthquake catalogue to identify earthquakes with epicenters located on land masses with deformation that... more |
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Poster 099 |
Geodesy |
The M7 2016 Kumamoto, Japan, Earthquake: 3D coseismic deformation from differential topography
Chelsea Scott, Ramon Arrowsmith, Lia Lajoie, Ed Nissen, Tadashi Maruyama, Chiba Tatsuro The April 2016 Kumamoto earthquake sequence ruptured the Hinagu and Futagawa faults on the Kyushu Island of SW Japan. Our work concentrates on the M7 mainshock, which ruptured 30 km of fault length with an oblique strike-slip mechanism. We present... more |
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Poster 100 |
Geodesy |
Capturing Postseismic Processes of the 2016 Mw 7.1 Kumamoto Earthquake, Japan, Using Dense, Continuous GPS and Short-repeat Time ALOS-2 InSAR Data: Implications for the Shallow Slip Deficit Problem
Chris Milliner, Roland Bürgmann, Teng Wang, Asaf Inbal, David Bekaert, Cunren Liang, Eric Fielding Separating the contribution of shallow coseismic slip from rapidly decaying, postseismic afterslip in surface rupturing events has been difficult to resolve due to the typically sparse configuration of GPS networks and long-repeat time of InSAR... more |
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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.