An Automatic Processing System for Broadcasting Earthquake Alarms

Remote Detection of the Electric Field Change Induced at the Seismic Wave Front from the Start of Fault Rupturing

“…In the earthquake early warning (EEW) system available now in Japan [29,30,32,51], the focal parameters are determined by the use of P wave arrival data at a small number of points. The practical use of this information started in October 2007 [29], with the implementation of particular countermeasure systems such as the emergency shutdown of gas fittings and home electrical devices [51].…”

“…The most interesting problem is to investigate whether the signal starts at the beginning of the fault rupture and to understand the generation and the propagation mechanism. The propagation speed of the signal is another important point to be revealed, especially from the viewpoint of application to the earthquake early warning (EEW) system [28][29][30][31][32]. The greater speed of this electric field variation is expected to provide several more critical seconds to issue the warning before the arrival of the hazardous S wave, which could contribute to decreasing the damage to life and property during an earthquake.…”

Eos, Transactions, American Geophysical Union Volume 89, Number 8, 19 February 2008

“…The technique for quickly determining the hypocenter and magnitude is based on a combination of several methods developed by a joint research project between JMA and Japan's Railway Technical Research Institute (RTRI) [Odaka et al, 2003;Tsukada et al, 2004;Kamigaichi, 2004], and by Japan's National Research Institute for Earth Science and Disaster Prevention (NIED) [Horiuchi et al, 2005], all of which aim to determine, within a few seconds, the hypocentral parameters using records of a single or a few stations.…”

Toward a Loss-Driven Earthquake Early Warning and Rapid Response System for Kyrgyzstan (Central Asia)

“…The aim of the EEW system is to detect the occurrence of an earthquake and to determine its relevant characteristics (such as location and magnitude) early enough to predict the ground shaking at the target site before the S-wave arrival. Possible emergency protocols that can be activated upon event detection range from slowing down or stopping rail traffic (Nakamura, 2004;Horiuchi et al, 2005;Espinosa-Aranda et al, 2011), safely shutting down or activating protective measure of critical infrastructures such as nuclear power plants (Saita et al, 2008), to broadcasting alerts to the general public (Wenzel and Lungu, 2000;Lee and EspinosaAranda, 2002;Allen and Kanamori, 2003;Horiuchi et al, 2005;Wu et al, 2007). Only few systems have been actually implemented and are currently operational.…”