The seismoscope is a simple instrument designed originally to give a largely qualitative indication of the strong ground motions produced by an earthquake. It consists of a smoked watch glass attached to a two-degree-of-freedom pendulum with a period of 1⁄4 sec and damping about 10 per cent of critical; a pen records the pendulum motions on the watch glass. One point on the displacement spectru...

The combined use of seismic and geodetic observations is now a common practice for finite-fault modeling and seismic source parametrization. With the advent of highrate 1Hz GPS stations the seismological community has recently begun looking at GPS data as a valid complement to the seismic-based methodologies for Earthquake Early Warning (EEW). In the standard approaches to early warning, the in...

This report reviews the soil-structure interaction (SSI) researches relating to three major earthquakes recently occurred in Japan, which include the 1993 Kushiro-oki earthquake, aftershocks of the 1993 Hokkaido-Nansei-oki earthquake and the 1995 Hyogo-ken Nanbu earthquake. The review work is focussed on the simulation analyses conducted on the basis of simultaneous earthquake records observed ...

Short-period (SP) and long-period (LP) seismograms written by the main shock and two principal aftershocks of the 1976 Friuli, Italy, earthquake sequence are modeled in the t ime domain using synthetic seismograms. The main shock occurred on 6 May 1976 (20h OOm, Ms = 6.5) and both aftershocks on 15 September 1976 (03h 15m, Ms -6.0 and 09h 21m, Ms = 5 .9 ) , Source models were determined init ia...

An Mw7.1 Kumamoto earthquake occurred at 01:25:05 on April 16, 2016 (JST). The earthquake involved a rupture at a shallow depth along a strike-slip fault with surface breaks. Near-fault ground motion records, especially those of a strike-slip earthquake, can provide us with direct information on the earthquake source process. During the earthquake, near-fault seismograms were obtained at KMMH16...

A new machine learning model, named, EEWPEnsembleStack has been developed for predicting the magnitude of earthquake from a few seconds recorded ground motion after arrival P phase. The testing and training dataset consists 2360 591 strong-motion records central Japan by Kyoshin Network. Eight parameters that are well correlated with have used model. Feature ablation study using several models ...

Hybrid control system composed of a base isolation system and a magneto-rheological damper so-called smart base isolation is one of effective semi-active control system in controlling the seismic response of structures. In this paper, a design method is proposed for designing the smart base isolation system in order to achieve an effective performance under multiple earthquakes. The base mass, ...

AIMS While previous studies reported a short-term increase in individual cardiovascular disease (CVD) after great earthquakes, mid-term occurrences of all types of CVDs after great earthquakes are unknown. We addressed this important issue in our experience with the Great East Japan Earthquake (11 March 2011). METHODS AND RESULTS We retrospectively examined the impact of the Earthquake on the...