8 research outputs found
Controls on earthquake rupture and triggering mechanisms in subduction zones
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2010Large earthquake rupture and triggering mechanisms that drive seismicity in
subduction zones are investigated in this thesis using a combination of earthquake
observations, statistical and physical modeling. A comparison of the rupture
characteristics of M ≥ 7.5 earthquakes with fore-arc geological structure suggests that
long-lived frictional heterogeneities (asperities) are primary controls on the rupture extent
of large earthquakes. To determine when and where stress is accumulating on the
megathrust that could cause one of these asperities to rupture, this thesis develops a new
method to invert earthquake catalogs to detect space-time variations in stressing rate.
This algorithm is based on observations that strain transients due to aseismic processes
such as fluid flow, slow slip, and afterslip trigger seismicity, often in the form of
earthquake swarms. These swarms are modeled with two common approaches for
investigating time-dependent driving mechanisms in earthquake catalogs: the stochastic
Epidemic Type Aftershock Sequence model [Ogata, 1988] and the physically-based rate-state
friction model [Dieterich, 1994]. These approaches are combined into a single
model that accounts for both aftershock activity and variations in background seismicity
rate due to aseismic processes, which is then implemented in a data assimilation
algorithm to invert catalogs for space-time variations in stressing rate. The technique is
evaluated with a synthetic test and applied to catalogs from the Salton Trough in southern
California and the Hokkaido corner in northeastern Japan. The results demonstrate that
the algorithm can successfully identify aseismic transients in a multi-decade earthquake
catalog, and may also ultimately be useful for mapping spatial variations in frictional
conditions on the plate interface.Funding for this research was provided by a WHOI Hollister Research
Fellowship, a National Defense Science and Engineering Graduate Fellowship, National
Science Foundation Division of Earth Sciences (EAR) grant #0738641, United States
Geological Survey National Earthquake Hazards Reduction Program Award
#G10AP00004, and the WHOI Academic Programs Office
Influence of fore-arc structure on the extent of great subduction zone earthquakes
Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 112 (2007): B09301, doi:10.1029/2007JB004944.Structural features associated with fore-arc basins appear to strongly influence the rupture processes of large subduction zone earthquakes. Recent studies demonstrated that a significant percentage of the global seismic moment release on subduction zone thrust faults is concentrated beneath the gravity lows resulting from fore-arc basins. To better determine the nature of this correlation and to examine its effect on rupture directivity and termination, we estimated the rupture areas of a set of Mw 7.5–8.7 earthquakes that occurred in circum-Pacific subduction zones. We compare synthetic and observed seismograms by measuring frequency-dependent amplitude and arrival time differences of the first orbit Rayleigh waves. At low frequencies, the amplitude anomalies primarily result from the spatial and temporal extent of the rupture. We then invert the amplitude and arrival time measurements to estimate the second moments of the slip distribution which describe the rupture length, width, duration, and propagation velocity of each earthquake. Comparing the rupture areas to the trench-parallel gravity anomaly (TPGA) above each rupture, we find that in 11 of the 15 events considered in this study the TPGA increases between the centroid and the limits of the rupture. Thus local increases in TPGA appear to be related to the physical conditions along the plate interface that favor rupture termination. Owing to the inherently long timescales required for fore-arc basin formation, the correlation between the TPGA field and rupture termination regions indicates that long-lived material heterogeneity rather than short timescale stress heterogeneities are responsible for arresting most great subduction zone ruptures.A. Llenos was
supported by a National Defense Science and Engineering Graduate
fellowship
Ensembles of ETAS Models Provide Optimal Operational Earthquake Forecasting During Swarms: Insights from the 2015 San Ramon, California Swarm
Latency and geofence testing of wireless emergency alerts intended for the ShakeAlert® earthquake early warning system for the West Coast of the United States of America
ShakeAlert, the earthquake early warning (EEW) system for the West Coast of the United States, attempts to provides crucial warnings before strong shaking occurs. However, because the alerts are triggered only when an earthquake is already in progress, and the alert latencies and delivery times are platform dependent, the time between these warnings and the arrival of shaking is variable. The ShakeAlert system uses, among other public alerting platforms like a mobile phone operating system, smartphone apps, and the Federal Emergency Management Agency Integrated Public Alert & Warning System (IPAWS). IPAWS sends Wireless Emergency Alerts (WEAs) informing people via their smartphones and other mobile devices about various events, such as natural hazards, child abductions, or public health information about COVID-19. However, little is known about the IPAWS delivery latencies. Given that people may have only a few seconds of notice after they receive an alert to take a protective action before they feel earthquake shaking, quantifying latencies is critical to understanding whether the IPAWS system is useful for EEW. In this study, we developed new methods to test the IPAWS distribution system's performance, both with devices in a controlled environment and as well as with a 2019 community-based feedback form, in Oakland and San Diego County, California, respectively. The controlled environment test used mobile phones (including smart and non-smart phones) and associated devices to determine alert receipt times; the community research form had participants self-report their receipt times. By triangulating the data between the controlled test environment and the community research, we determined the latency statistics as well as whether the geofence (the geographic area where the alert was intended to be sent) held broadly. We found that the latencies were similar between the two tests despite the large differences in population sizes. WEA messages were received within a median time frame of 6–12 s, and the geofence held with only a few exceptions. We use this latency to assess how the system would have performed in two large earthquakes, the 1989 M6.9 Loma Prieta and 2019 M7.1 Ridgecrest earthquakes, which both occurred near our WEA test locations. Our analysis revealed that had IPAWS been available during those earthquakes, particularly Loma Prieta, it would have provided crucial seconds of notice that damaging shaking was imminent in some locations relatively far from the epicenter. Further, we find affordable non-smart phones can receive WEAs as fast as smartphones. Finally, our new method can be used for latency and geospatial testing going forward for IPAWS and other similar alerting systems.ISSN:0925-753