The 3 February 2020 M S 5.1 Qingbaijiang earthquake, southwestern China, is the closest recorded ? 5.0 event to downtown Chengdu City date, with an epicentral distance of only 38 km. Here we analyze seismic data from Sichuan and regional networks, employ a multi-stage location method relocate earthquakes that have occurred along central northern segments Longquanshan fault zone since 2009, incl...

a set $s$ of vertices in a graph $g=(v,e)$ is called a total$k$-distance dominating set if every vertex in $v$ is withindistance $k$ of a vertex in $s$. a graph $g$ is total $k$-distancedomination-critical if $gamma_{t}^{k} (g - x) < gamma_{t}^{k}(g)$ for any vertex $xin v(g)$. in this paper,we investigate some results on total $k$-distance domination-critical of graphs.

[1] We study seismic velocity and attenuation structures in the top 400 km of the Earth’s inner core based on modeling of differential traveltimes, amplitude ratios, and waveforms of the PKiKP-PKIKP phases observed at the epicentral distance range of 120 –141 and the PKPbc-PKIKP phases observed at the distance range of 146 –160 along equatorial paths. Our data are selected from the seismograms ...

An algorithm is presented for testing the calibration accuracy of both z-accelerometers and pressure gauges (PG) installed in seafloor observatories. The test based on linear relationship between vertical acceleration component movement variations pressure, which a direct consequence Newton's 2-nd law holds valid frequency range “forced oscillations.” operability demonstrated using signals regi...

Fragility surfaces give the probability of failure for structural or non-structural systems as a function of two parameters, the earthquake magnitude and epicentral distance. These parameters provide a unique characterization of the ground motion. In contrast, the current characterization of the ground motion by a single parameter, e.g., the Peak Ground Acceleration (PGA), can be unsatisfactory...