A Probabilistic Seismic Hazard Analysis Using Pga and PGV as Ground Motion Intensity Measures

Abstract

to imprQve the accuracy of rlsk analysis ． authors propose a seismic hazard analysis method u §由 g two gr〔｝und motion intens ． ity measures ；peak ground acceleration (PGA)and peak ground velocity (PGV) ． Sinco the seismic hazard is expressed by the joint probability 〔 ｝fexceedance fbr given PGA and PG-it is necessary to evalua1e a correlation between these intensity measures ． Recently large amounts ofearthquake observation data have been utilized by K −NET and KiK −net databases ， so tha 【the above correlation can be calcu 且 ated ． In lhis paper ， the correlation in the Kanto district is evaluated ， and is applied to seven reference Sites ， fblbwed l)y the conclusion that N 〔 ｝ rth −Kanto area and Sou 山 一 Kanto area possess different seismic hazard ln the aspec1s ofthe shape ofhazard plane， and the inclusion ofdependency of correlation on seismic magnitude or on the focal distance has a large effect on the hazard estlmation ， Keywords ' Probab ゴ ' istic seismic hax硼 ' d'ana ！ ysis ， Groundmotion intens め！ C ') nre ' ation ， κ 一 NE T， KiK −net

An Experimental Study on Relative Displacement Sensing Using Phototransistor Array for Building Structures

“…The procedure of calculation is as follows: first, we find out a V max -PT at which the beam center position is closest to and thus outputs the highest voltage among the PT array; second, we obtain output voltages of both the PTs adjacent to the V max -PT. Then we calculate the position of a light beam center using (2) with the ratio of the obtained output voltages. As a result, we can obtain sufficiently accurate position with the RDS.…”

“…The output voltage of each PT was sampled at the rate of more than 200 samples per second with a multichannel 16-bit data logger. According to (2), the parallel displacement was estimated. Finally, by comparing the measured value with the reference, the accuracy of our RDS was verified.…”

“…For the purpose of assessing the condition of a civil structure subjected to an earthquake, whether the assessment itself is in realtime or not, it is of great significance to recognize how a structural system responds to seismic excitations. In most cases [1][2][3][4][5][6], such a judgment is made with the acceleration response measurement. At the current stage, judgment based on the acceleration measurement, we would say, is a matter of necessity rather than choice, although more useful information would be expectedly obtained with the response displacement in the lateral direction.…”