USGS, Menlo Park (Scott Haefner public
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Current policies, risk management practices, emergency preparedness, and scientific research interests are often shaped by the effects of past events. However, our past experiences and current methodologies may not prepare us for low probability events that have the potential to affect our natural, built, and social environments. This is especially…
 
Geologic slip rates represent time-averaged fault displacement and are a handy metric to define a fault's activity. Useful as they are, slip rates aggregate numerous earthquakes that have occurred between field-based observation points, which are typically dated offset geomorphic features (e.g. stream channels or terrace risers). This means that ti…
 
Relative crustal motions along active faults generate earthquakes, and repeated earthquake cycles build mountain ranges over millions of years. However, the long-term summation of elastic, earthquake-related deformation cannot produce the deformation recorded within the rock record. Here, we provide an explanation for this discrepancy by showing th…
 
Earthquake swarms are common occurrences in both volcanic and tectonic environments. Swarms and their seismic waves provide a critical window into active processes within the earth, often reflecting the interaction between crustal fluids and earthquake faulting, with dynamic interplay between stress, permeability, and fluid pressure. Swarms of this…
 
Earthquakes occur in clusters or sequences that imply heterogeneous fault properties and complex triggering mechanisms. We have developed a laboratory experiment and supporting numerical simulations that illustrate delayed triggering and repeating interactions between two seismic asperities that result from locally high normal stress. We utilize a …
 
Older adults are often considered to be a socially vulnerable population; however, these individuals are frequently overlooked and are rarely consulted in research or practice. Disaster vulnerability is a complex and multi-dimensional issue that reflects a variety of factors including geography, the built environment, and social stratification, amo…
 
Systematically characterizing slip behaviours on active faults is key to unraveling the physics of tectonic faulting and the interplay between slow and fast earthquakes. Interferometric Synthetic Aperture Radar (InSAR), by enabling measurement of ground deformation at a global scale every few days, may hold the key to those interactions. However, a…
 
Historical rupture mapping and numerical modeling have shown that geometric complexities along faults, such as bends and stepovers, act as barriers to earthquake propagation. Over multiple earthquake cycles these complexities may shift between periods of more or less efficiency as rupture barriers due to local stress heterogeneities, leading to "ea…
 
Large damaging earthquakes have traditionally been the focus of earthquake studies, understandably so because they are recorded well by a host of sensors. With recent explosion of the number of seismic stations and computational power, we are able to focus on small and even tiny earthquakes, previously not detectable using conventional methods. Aft…
 
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