A predicting method for magnitude 1 earthquake alarm of high-speed&nbsp; railways based on seismic early radiated P-wave energy

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (19) : 14-22.

A predicting method for magnitude 1 earthquake alarm of high-speed railways based on seismic early radiated P-wave energy

SONG Jindong, JIAO Congcong, LI Shanyou, HOU Baorui, WANG Yuan

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Abstract

Here, a new approach to predict 40 cm/s2 with 4-level based on seismic early radiated P-wave energy was proposed with predicting accurately and rapidly the magnitude 1 earthquake alarm of high-speed railways taken as the objective.This method used Japan K-net strong ground motion data, based on the linear statistical relation between the ground motion parametric squared velocity integral IV2 to characterize earthquake rupture radiation energy and the peak ground acceleration (PGA), to predict if PGA reaches 40 cm/s2 using the magnitude 1 earthquake alarm threshold corresponding to IV2 of P-wave.Meanwhile, a parametric characteristic period τc being able to stably estimate the seismic magnitude M was introduced.The threshold of P-wave τc was used to characterize the large seismic magnitude event, and reflect the influence of seismic magnitude on the predicted results.Based on thresholds of IV2 and τc, the method model to predict the magnitude 1 earthquake alarm with 4-level was built.Using the strong ground motion data of 14 April 2016 Kumamoto earthquake (Mj=6.5) recorded at K-net stations along Kyushu Shinkansen, analyses were done for correctness and timeliness of the magnitude 1 earthquake alarm.The results showed that the magnitude 1 earthquake alarm can be predicted within 1 second after P-wave triggers at the station nearest the epicenter; this prediction time is 3.34 s and 4.84 s earlier than Kyushu Shinkansen derailment time and the emergency earthquake report time issued by the meteorological agency, respectively.

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High-speed railway / Earthquake alarm / Radiated energy / P-wave / Threshold

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SONG Jindong, JIAO Congcong, LI Shanyou, HOU Baorui, WANG Yuan. A predicting method for magnitude 1 earthquake alarm of high-speed railways based on seismic early radiated P-wave energy[J]. Journal of Vibration and Shock, 2018, 37(19): 14-22

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