The Papuan Fold and Thrust Belt (PFTB) in Papua New Guinea is actively forming within a complex tectonic setting at the boundary of obliquely converging Australian Pacific plates. inaccessibility PFTB make it one least well-understood fold thrust belts on Earth. On February 25, 2018, Mw 7.5 earthquake occurred PFTB, triggering an aftershock sequence which included five events ≥Mw 6. In this stu...

This paper reviews seismic activity in and around the Kumamoto region before and after the April 16, 2016, Kumamoto earthquake of M7.3 using statistical models such as stationary, two-stage, and non-stationary epidemic-type aftershock sequence (ETAS) models to examine seismicity anomalies. Our findings are summarized as follows. First, most of the earthquake clusters before April 2016 are expla...

Swarms in Central Utah are situated the complex transition between Basin and Range (BR) province Colorado Plateau. Transecting transverse structures, volcanic deposits, hydrothermal systems complicate extensional BR horst graben structures provide a multitude of plausible triggering mechanisms. Revisiting catalog University Seismograph Stations (1981–2022), we analyze spatio-temporal patterns c...

The Bilila-Mtakataka Fault (BMF), at the southern end of western branch East African Rift System (EARS), has been used in various scaling relation studies and arguments about strength lithosphere. We present evidence for a similar, though more degraded, frontal scarp on graben-bounding synthetic Chirobwe-Ntcheu (CNF), showing that this fault is active simultaneously with BMF. deployed 17 geopho...

Based on waveform data from a profile of aftershocks following the north-south trace of the 28 June 1992 Landers rupture across the Mojave desert, we construct a new velocity model for the Mojave region that features a thin, slow crust. Using this model, we obtain source parameters, including depth and duration, for each of the aftershocks in the profile and, in addition, any significant (M > 3...

The observation of foreshocks preceding large earthquakes and the suggestion that foreshocks have specific properties that may be used to distinguish them from other earthquakes have raised the hope that large earthquakes may be predictable. Among proposed anomalous properties are the larger proportion than normal of large versus small foreshocks, the power law acceleration of seismicity rate a...

[1] We analyze the early aftershock activity of the 2004 mid-Niigata earthquake, using both earthquake catalog data and continuous waveform recordings. The frequencymagnitude distribution analysis of the Japan Meteorological Agency (JMA) catalog shows that the magnitude of completeness of the aftershocks changes from values around 5.0, immediately after the main shock, to about 1.8, 12 hours la...

When any earthquake occurs, the possibility that it might be a foreshock increases the probability that a larger earthquake will occur nearby within the next few days. Clearly, the probability of a very large earthquake ought to be higher if the candidate foreshock were on or near a fault capable of producing that very large mainshock, especially if the fault is towards the end of its seismic c...