Natural geohazards, such as earthquakes, volcanic eruptions, landslides, and volcanic collapse, are of immediate societal concern. In an oceanic setting (Fig. 1), all are capable of generating tsunami that threaten coastal zones at distances of many thousands of kilometers. This power and its effects were forcefully shown by the giant earthquake (� w 9.2) and tsunami of 26 December 2004 off t...

In this study we discuss the available data on seismicity and focal mechanisms in the Sannio-Matese area in order to obtain information on the stress field acting in the area. Background seismicity of the area is characterized by isolated events, with magnitude generally less than 2.5, on which is superimposed a swarm and seismic sequence activity of low magnitude (max magnitude 4.1). The epice...

We examine an application of Acoustic Emission (AE) technique for a probabilistic analysis in time and space of earthquakes, in order to preserve the valuable Italian Renaissance Architectural Complex named "The Sacred Mountain of Varallo." Among the forty-five chapels of the Renaissance Complex, the structure of the Chapel XVII is of particular concern due to its uncertain structural condition...

The region of northeastern France is affected by low-magnitude background seismicity, with the rare occurrence moderate earthquakes, which gives this a non-negligible seismic risk. We provide an overview seismicity and seismotectonics intraplate domain its sub-regions: Upper-Rhine Graben (URG), external range foreland Jura, Vosges, northern southern Belgium. Previously published catalogues over...

[1] We relate seismologically observable parameters such as radiated energy, seismic moment, rupture area, and rupture speed to the dynamics of faulting. To achieve this objective, we computed the radiated energy for 23 subduction zone earthquakes recorded between 1992 and 2001; most of these earthquakes have a magnitude Mw > 7.5, but we also included some smaller (Mw 6.7) well-studied subducti...

During earthquakes, fault rupture can involve multiple segments in synchronous or cascade mechanisms, leading to an increasing magnitude of the mainshock rate aftershocks. Since seismogenic portions faults are inaccessible, studying geometrical and mechanical interaction between exhumed contribute understanding multisegment earthquake scenarios at depth. We investigated a segmented active norma...

Induced earthquakes currently pose a significant hazard in the central United States, but there is considerable uncertainty about the severity of their ground motions. We measure stress drops of 39 moderate-magnitude induced and tectonic earthquakes in the central United States and eastern North America. Induced earthquakes, more than half of which are shallower than 5 km, show a comparable med...

Abstract The island of Ischia, located in the Gulf Naples, represents an unusual case resurgent caldera where small-to-moderate magnitude volcano-tectonic earthquakes generate large damage and catastrophic effects, as 4 March 1881 ( I max -VIII-IXMCS) 28 July 1883 X-XI MCS) historical earthquakes, recent 21 August 2017 MW = 3.9, event. All these struck northern area island. With about 65,000 in...

S U M M A R Y Locating earthquakes from the beginning of the modern instrumental period is complicated by the fact that there are few good-quality seismograms and what traveltimes do exist may be corrupted by both large phase-pick errors and clock errors. Here, we outline a Bayesian approach to simultaneous inference of not only the hypocentre location but also the clock errors at each station ...