Sentence examples for earthquake focus from inspiring English sources

Seismic rays for many paths of P and S waves leaving the earthquake focus F are shown in the figure.

Fault rupture starts at the earthquake focus, a spot that in many cases is close to 5 15 km under the surface.

Each segment either starts at the earthquake focus or at one of the main seismic discontinuities in a planet: (1) the surface; (2) the core-mantle boundary (CMB); (3) the inner core-outer core boundary (ICB).

where (x,y,z,t) are the investigated site and time, t i and l i are the origin time and rupture length of the ith considered earthquake and r i is the distance between the investigated site and earthquake focus.

The NZVAP approach outlined by Smith (2009), encompassing GeoNet at its core, still supports the existence of regions having existing scientific or planning advisory groups with a volcanic and/or earthquake focus, but it also addresses the need for mobilisation of NZ-wide science capability, while remaining responsive to local CDEM needs (see also Section 5.2; Jolly and Smith 2012).

Most of these effects occur on solid ground, but, since most earthquake foci are actually located under the ocean bottom, severe effects are often observed along the margins of oceans.

Fig. 2 Cross-sections of the earthquake foci along the subduction zone for each of the four sectors-domains shown in Fig. 1.

We also propose a new method to detect precursory change around the large asperity prior to a megathrust earthquake, focusing on the spatio-temporal change of migration speed and moment release rate for nearby slow earthquakes.

We observe a clear arrival approximately 8 s after the direct P wave and find that it is an S-to-P convemittedave emitted upward from the deepest earthquake foci and reflected downward by a horizontal interface located nearly 30 km above the foci.

A recent study by Kubo et al. ([2009]) has determined the temperature near the deep earthquake foci inside the Mariana slab, around 600 km depth, to be about 550°C based upon the observation of a metastable olivine wedge (Kaneshima et al. [2007]).

We note that it is by no means straightforward to reveal the accurate thermal structures of deep slabs around deep earthquake foci and that previous studies relying mostly on global seismicity data sets and utilizing Φ of deep slabs have a weakness in this respect.