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185:, but with faster lead times in order to issue more timely warnings within two seconds or less. CIRES offers alert systems for buildings and personal use, which also come pre-installed with the official warning sound used for earthquake alerts in Mexico. On its network of transmitters, CIRES issues required weekly tests every three hours to ensure receivers are connected to its network, as well as earthquake warnings when necessary. More than 90,000 users in Mexico City, including almost all public schools, have receivers. The
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215:. Some people may have taken the alert for a continuation of an earthquake drill held three hours before. Six stations reported, and alerts 12 to 48 seconds before the shock were also provided to Oaxaca, Acapulco, Chilpancingo, Guadalajara, Colima and Puebla (this has not been verified by an external agency).
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Historically, CIRES has been able to provide 60 seconds of warning time to Mexico City in the event of an earthquake along the southern coast, and as many as 30 seconds to Oaxaca City if an earthquake occurs near the coast of that state, with shorter lead times for earthquakes centered closer to the
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throughout the city in 1987, allowing data to be obtained on ground movements in the area. With the support of the local government, CIRES developed Mexico City's earthquake alert system, which began operating with 12 sensors in 1991 and has been publicly available since 1993.
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CIRES alerts are also transmitted by major broadcasters in Mexico City, Toluca, Acapulco, Chilpancingo and Oaxaca and, as of 2015, through Mexico City's municipal loudspeaker network with more than 8,200 speakers installed.
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247:"The Mexican Seismic Alert System (SASMEX): Its Alert Signals, Broadcast Results and Performance During the M 7.4 Punta Maldonado Earthquake of March 20th, 2012"
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issuing alerts available to the public. SASMEX supplies regular information of all kinds, including reports of earthquakes of all magnitudes, and drills, via
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additionally receives SASMEX alerts, although not for public dissemination but instead to stop trains or delay departures as necessary.
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prompted a national rethink of earthquake and emergency preparedness measures. The government of Mexico City sponsored the placement of
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covering portions of central and southern Mexico. It currently provides up to 60 seconds' warning of earthquakes to
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451:"The results of the Seismic Alert System of Mexico SASMEX, during the earthquakes of 7 and 19 of September 2017"
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or CIRES). The SASMEX sensor network serving Mexico City has been regarded as the first earthquake
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CIRES transmits earthquake early warning alerts through a network of VHF stations similar to the
335:"The seismic alert system in Mexico City: an example of a successful Early Warning System (EWS)"
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SASMEX's warning was activated a few seconds after the shaking was felt in Mexico City for the
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Earthquake warning system covering portions of central and southern Mexico
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The SASMEX system contains 97 sensors, primarily along the coast from
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Espinosa Aranda, J. M., Sr.; Cuellar
Martinez, A. (December 2017).
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402:"El DF realiza prueba de alerta sĂsmica en sistema de altavoces"
496:"Are Mexico's two September earthquakes connected? - BBC News"
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CIRES was tapped to develop a similar system for the state of
256:. Advanced Technologies in Earth Sciences. pp. 71–87.
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333:Suárez, Gerardo; GarcĂa Acosta, Virginia (2014).
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304:"ÂżCĂłmo funciona la #AlertaSĂsmica?"
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381:from the original on 28 June 2017
281:from the original on 2017-07-29.
245:A. Cuéllar; et al. (2014).
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547:1991 establishments in Mexico
494:Amos, Jonathan (2017-09-20).
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262:10.1007/978-3-642-12233-0_4
213:1985 Mexico City earthquake
119:1985 Mexico City earthquake
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455:AGU Fall Meeting Abstracts
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163:Chiapas
113:History
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