[1] Two different innermost inner core (IMIC) models have recently been proposed, each with different radii and different orientation and strength of anisotropy. In order to test these IMIC models, we have systematically assembled a high quality dataset of broadband PKIKP data in the epicentral distance range of 150 to 180 . Our new dataset consists of 1,100 individually measured absolute PKIKP...

A geomagnetic observatory named SFEMS is being operated on the deep seafloor in the northwest Pacific since August, 2001. SFEMS is capable of measuring both scalar and vector geomagnetic fields as well as the seafloor instrument's precise attitudes, which makes it a powerful tool in detecting the so-called oceanic dynamo effect. It was found that SFEMS captured clear magnetic signals generated ...

The reciprocal dissipation factor Q of P and S waves is determined by spectral analysis of records of earthquakes whose epicentral distance from Tsukuba ranges from 36 to 76 degrees, with special emphasis on that of short period S waves. A constant velocity radiated spectrum near the source is assumed. The value of QƒÀ(Q for S waves) is found between 300 to 2400 in the period range from 0.1 to ...

Abstract The loss of support beam elements in Italian precast buildings is one the main vulnerabilities recorded past earthquakes. reason for falling due to absence adequate structural details beam-column joints, which were typically relying on friction located regions previously classified as non-seismic prone. To guarantee safety whole existing building stock, this collapse mechanism must be ...

Recently, the distributed acoustic sensing (DAS) measurement, which utilizes an optical fiber itself as a sensor, becomes popular for various fields and is being applied to seismic observations. The shortest spatial sampling of DAS observations reaches few meters, total measurement distance greater than 50 km. A high temporal rate achieved. Due these characteristics, allows dense observation li...

InSAR images allow to detect the coseismic deformation, delimiting epicentral area where larger displacement has been concentrated. By inspecting fringe patterns it is commonly recognized that, for dip-slip faults, most deformed elliptical, or quadrilobated strike-slip faults. This coincides with surface projection of volume coseismically mobilized in hanging wall thrusts and normal crustal wal...