Abstract The mechanisms leading to large earthquakes are poorly understood and documented. Here we characterize the long‐term precursory phase of 1 April 2014 M w 8.1 North Chile megathrust. We show that a group coastal GPS stations accelerated westward 8 months before main shock, corresponding 6.5 slow slip event on subduction interface, 80% which was aseismic. Concurrent interface foreshocks underwent diminution their radiation at high frequency, as shown by temporal evolution Fourier...

Abstract In tectonically active mountain belts, landslides contribute significantly to erosion. Statistical analysis of regional inventories earthquake-triggered-landslides after large earthquakes (Mw > 5.5) reveal a complex interaction between seismic shaking, landslide material, and rainfall. However, the contributions each component have never been quantified due lack in-situ data for landslides. We exploited 3-year geodetic dataset slow-moving in Peru affected by local seasonal...

During the Pliocene, subduction of Chile ridge beneath South American margin was coeval with emplacement Cabo Raper pluton located at seaward edge Taitao peninsula. The chemical characteristics combined available tectonic data allow us to reconstruct paleogeometry 3–4.2 m.y. ago. When compared modern configuration, volume material removed by erosion can be estimated quantitatively. From 1.5–1.6 Ma, 625 km 3 rock were along each kilometre peninsula transect. This leads a conservative...

Abstract Slow, aseismic slip plays a crucial role in the initiation, propagation, and arrest of large earthquakes along active faults. In addition, controls budget elastic strain crust, hence amount energy available for upcoming earthquakes. The conditions slow include specific material properties fault zone, pore fluid pressure, geometrical complexities plane. Fine scale descriptions at surface depth are key to determine factors controlling occurrence slow, versus rapid, seismic slip. We...

Abstract We document interactions between intermediate depth and interplate seismicity in the North Chile subduction zone, over a 25 year period (1990–2015). show that 2005 M w 7.8 Tarapaca slab‐pull earthquake was followed by 9 years of enhanced deep shallow seismicity, together with decrease eastward average GPS velocities associated coupling, eventually leading to 2014 8.1 Iquique megathrust earthquake. In contrast, ruptures (e.g., 8.0 Antofagasta 1995, or 2014) initiate several silent...

Recent studies have shown that the Himalayan region is under threat of earthquakes magnitude nine or larger. These estimates are based on comparisons geodetically inferred moment deficit rate with seismicity region. However, these did not account for physics fault slip, specifically influence frictional barriers earthquake rupture dynamics, which controls extent and therefore large earthquakes. Here we combine an improved probabilistic estimate results from dynamic models cycle to more fully...

Large subduction earthquakes with magnitudes (Mw) greater than 8.0 are devastating events. Such large remain poorly recorded due to their infrequent occurrence. This lack of observational data limits our ability study rupture dynamics and accurately predict future broadband ground motion. To address these limitations, physics-based modeling has emerged as a powerful approach for understanding the associated motions. In this study, we analyze kinematic processes influence on synthetic...

Seismic waves from distant earthquakes are known to trigger and slow slip events on active faults. However, the underlying physics of such interaction is poorly understood. Dynamic rearrangement grains in a granular medium, pore pressure changes within that same gouge or response frictional interface have been proposed explain triggering. The main issue lack observations at various scales triggered event nature, seconds years local meter-scale full-scale image induced fault.We use data dense...

Aseismic slip, particularly in the form of Slow Slip Events (SSEs), plays an undisputed role release stress along faults, occurring slowly and without generating classical seismic waves. SSEs are recognized as critical phenomena influencing various stages cycle, including postseismic phases, earthquake triggering or arresting, interseismic transients. However, mechanisms governing their underlying physics remain debated. Three primary hypotheses have been proposed: (1) heterogeneities fault...

Chile's diverse climate spans a remarkable range, from the hyper-arid desert in north to Mediterranean center, temperate humid conditions south, and polar tundra Patagonia. This climatic gradient provides unique opportunity study synchronized variability of tropospheric water vapor (TWV) precipitation processes. In recent years, GNSS has emerged as powerful satellite-based tool capable capturing not only tectonic deformation but also meteorological One key parameters derived processing is...

Slow-slip events (SSEs) are episodic fault slip phenomena that involve the gradual and aseismic release of tectonic stress, bridging gap between rapid rupture regular earthquakes steady sliding along interfaces. SSEs common in megathrusts, having been observed most well geodetically-instrumented subduction margins worldwide, both on shallow plate interface (less than 10 km depth) deeper (25–60 km). We explore relations occurrence various parameters megathrusts at a global scale....

Despite extensive research over the years, weakening mechanisms that govern strain localization along deep subduction interfaces are still debated. These span from downdip boundary of seismogenic zone (∼350°C) to mechanical coupling transition with upper plate mantle near sub-arc depths (>600°C). Current thermo–mechanical models posit rock rheology is primarily stress- and rate-temperature-sensitive in absence mineral reactions. Strain accommodated by...

Abstract The Lesser Antilles subduction zone is a challenging region when it comes to unraveling its seismogenic behavior. Over the last century, megathrust has been seismically quiet, with no large thrust event recorded, which raises question whether this able produce interplate earthquakes or not. However, two historical in 19th M 7–8 1839 and 7.5–8.5 1843, are proposed have occurred along megathrust, although direct evidence exists. Here we provide new assessment of interseismic coupling...

Abstract Transient deformation associated with foreshocks activity has been observed before large earthquakes, suggesting the occurrence of a detectable preseismic slow slip during initiation phase. A critical issue consists in discriminating relative contributions from seismic and aseismic fault preparation phase earthquakes. We focus on April–May 2017 Valparaíso earthquake sequence, which involved M W = 6.9 preceded by intense foreshock activity. To assess contribution slip, we compare...

Detections of slow slip events (SSEs) are now common along most plate boundary fault systems at the global scale. However, no such event has been described in south Peru - north Chile subduction zone so far, except for early preparatory phase 2014 Iquique earthquake. We use geodetic template matching on GNSS-derived time series surface motion Northern to extract SSEs hidden within noise. detect 33 with durations ranging from 9 40 days and magnitudes Mw 5.6 6.2. The moment released by these...

Abstract Slow slip events (SSEs) regularly occur near the Boso Peninsula, central Japan. Their time of recurrence has been decreasing from 6.4 to 2.2 years 1996 2014. It is important better constrain history this area, especially as models show that intervals could become shorter prior occurrence a large interplate earthquake nearby. We analyze seismic waveforms more than 2,900 ( M ≥1.0) taking place in Japan, 1 April 2004 4 November 2015, calculating correlation and coherence between each...

Most earthquake ruptures propagate at speeds below the shear wave velocity within crust, but in some rare cases, reach supershear speeds. The physics underlying transition of natural subshear earthquakes to ones is currently not fully understood. observational studies have focused on determining which fault segments sustain grown ruptures. Experimentally cross-validated numerical models identified key ingredients required trigger a speed. However, conditions for such nature are still...

Abstract. On 23 November 2022, a MW 6.0 earthquake occurred in the direct vicinity of 7.1 Düzce that ruptured portion North Anatolian Fault 1999. The Mw event was attributed to small Karadere fault off main did not rupture during 1999 sequence. We analyze spatiotemporal evolution Gölyaka–Düzce seismic sequence at various scales and resolve source properties mainshock. Modeling decade-long background seismicity employing an Epistemic Type Aftershock Sequence model shows this almost...

Costa Rica is located at a subduction margin in complex tectonic setting where four plates (Caribbean, Coco, Nazca, and Panama) interact, large earthquakes are generated. Slow-Slip (SSEs) defined as seismic activity that involves the gradual aseismic release of stress. Therefore, SSEs play very role cycle, representing crucial element to be considered hazard assessment. These events common feature regimes have been reported most well geodetically instrumented zones worldwide. In northern...

Abstract Between 2010 and 2015 three giant earthquakes occurred in the Chilean subduction where oceanic Nazca plate plunges under South America. These were largest events there since gigantic M 9.5 1960 earthquake so their close occurrences raise question of a possible link between them. We show here that two‐and‐a‐half days after 8.2 Iquique earthquake, seismic activity started to increase downdip below (depth~100 km) future Illapel epicenter. This increase, which began with...

Inertia issues due to increased use of modern wind turbines (WTs) have gained attention during the last years, especially in isolated power systems with limited frequency control capabilities. Therefore, different strategies allow inertial response from WTs been proposed, either by considering deloaded operation or using part kinetic energy stored blades. Other including additional equipment like flywheels supercapacitors can also be found literature. In this paper, a comprehensive analysis...