Gaspard Farge

University of California, Santa Cruz | UCSC · Department of Earth & Planetary Sciences

In many subduction zones, the plate interface hosts intermittent, low-frequency, low-magnitude seismic tremor and low-frequency earthquakes (LFEs). Seismic activity clusters in episodic bursts that migrate along the fault zone in complex ways. Geological structures in fossil tremor source regions testify to large and pervasive variations of fluid p...

Along the strike of subduction zones, tectonic tremor episodicity is segmented on a geologic scale. Here, we study how this segmentation reflects large‐scale variations of the structure and conditions of the fault interface where tremor is generated. We try to understand which properties of the hydraulic system of the fault allow elementary tremor...

Along the strike of subduction zones, tectonic tremor activity is segmented on a geologic scale, indicating local variations of the tremor-generating process. Here, we study how strong temporal clustering and long-term recurrence of activity can emerge from the synchronization of elementary tremor sources, as they interact through fluid pressure tr...

The activity of the smallest earthquakes that can be detected in the Earth is a symptom of minute changes that occur beneath our feet. Microseismic activity can in particular be used to monitor how fluid flows in geological plumbing systems like faults or volcanoes, from deep sources of fluid to the surface. In subduction zones for instance, the pl...

The occurrence and the style of volcanic eruptions are largely controlled by the ways in which magma is stored and transported from the mantle to the surface through the crust. Nevertheless, our understanding of the deep roots of volcano-magmatic systems remains very limited. Here, we use the sources of seismovolcanic tremor to delineate the active...

In many subduction zones, the plate interface hosts intermittent, low‐frequency, low‐magnitude seismic tremor and low‐frequency earthquakes (LFEs). Seismic activity clusters in episodic bursts that migrate along the fault zone in complex ways. Geological structures in fossil tremor source regions testify to large and pervasive variations of fluid p...

Data visualization, and to a lesser extent data sonification, are classic tools to the scientific community. However, these two approaches are very rarely combined, although they are highly complementary: our visual system is good at recognizing spatial patterns, whereas our auditory system is better tuned for temporal patterns. In this article, da...

Low‐frequency earthquakes (LFEs) are detected within tremor, as small, repetitive, impulsive low‐frequency (1–8 Hz) signals. While the mechanism causing this depletion of the high‐frequency content of their signal is still debated, this feature may indicate that the source processes at the origin of LFEs are different from those for regular earthqu...

This catalog is a subset of Frank et al., 2014 [ref 2] catalog, for which Farge et al., 2020 [ref 1] estimated seismic moments and corner frequencies. The archive contains a catalog of events detection times, location, seismic moments and corner frequency, and a bulletin listing the time of detection on each station used for characterization. Plea...

The activity of slow-earthquakes in subduction zones have been closely linked to fluid circulation processes — like hydro-fracturation and pore-pressure pulses — on the one hand by geological observations and on the other hand by slow-earthquake triggering and interaction models. In deep fault zone environments, where slow slip events and various r...

From nearly locked to earthquake ruptures, fault zones witness a continuous spectrum of transient, slow slip behaviors. On the shorter and smaller end of slip transients, events are detected through low-frequency earthquake activity peaks that indicate active sliding of the interface. The activation of those slow-slip transients are likely governed...