although there is enough knowledge indicating on the influence of frequency content of input motion on the deformation demand of structures, state-of-the-practice seismic studies use the intensity measures such as peak ground acceleration (pga) which are not frequency dependent. the v max/a max ratio of strong ground motions can be used in seismic hazard studies as the representative of frequen...

CWI's research has a theme-oriented structure and is grouped into four clusters. Listed below are the names of the clusters and in parentheses their acronyms. 1. INTRODUCTION A feature of a seismic earthquake signal is that it is built up by several different seismic waves, characterizing the type of signal. In this paper we are only interested in two of these waves, namely the primary wave (P-...

[1] The deployment of USArray across the continental U.S. has prompted developments within surface wave tomography to exploit this unprecedented data set. Here, we present a method to measure a new surface wave observable: broadband surface wave amplification that provides new and unique constraints on elastic velocities and density within the crust and upper mantle. The method, similar to its ...

To study how an extreme wave load on a maritime structure causes structural deformation, experiment is conducted to measure the response of one degree-of-freedom pendulum in focused, breaking wave. The tube that makes up base covers almost entire width tank so three-dimensional effects can be considered small. varies focus location with respect position as well vertical clearance between and me...

SUMMARY The within-site variability in site response is the randomness at a given from different earthquakes and treated as aleatory current seismic hazard/risk analyses. In this study, we investigate single-station linear K-NET KiK-net stations Japan using large number of earthquake recordings. We found that standard deviation horizontal-to-vertical Fourier spectral ratio individual sites, (HV...

S U M M A R Y We present a re-evaluation of the seismological properties of the Aleutian ‘tsunami earthquake’ of 1946 April 1, characterized by a deceptively low conventional magnitude (7.4) in view of its catastrophic tsunami, both in the near and far fields. Relocation of 40 aftershocks show that the fault zone extends a minimum of 181 km along the Aleutian trench, in a geometry requiring a b...

Here we demonstrate a model that combines Tweets following significant earthquakes with basic site and earthquake characteristics to produce a rapid estimate of the ground shaking intensity. We used all geo-tagged Tweets around the world containing the keyword “earthquake” or “tsunami” in several languages that occurred in the first 10 minutes following Japanese earthquakes of magnitude 6 or gr...

recordings of ambient noise or microtremors are increasingly used to find valuable information on soil in one dimension at a given site. ambient vibrations, which are assumed to be mainly composed of surface waves, can be used to determine the surface wave dispersion curve in order to retrieve shear wave velocity profile. in this regard, microtremors are usually recorded simultaneously in an ar...