began to roll out a system<\/a>\u00a0that does not need a traditional seismic network at all. It takes advantage of tiny accelerometers in Android phones that can also detect Earth\u2019s motion. Although they are less precise than traditional sensors, the combined sensing of many phones can be effective enough. Location and intensity measurements are sent to Google\u2019s servers, where an algorithm identifies the quake. For earthquakes magnitude 4.5 or bigger, alerts are pushed out to vulnerable people.<\/p>\nIn the new study, Google researchers report issuing alerts for 1279 events. Only three ended up being false alerts, triggered, for instance, by vibrations from thunderstorms. Millions of users in 98 countries received alerts from the system and surveys after the earthquakes found that 84% of respondents would trust the alerts more next time. The system showed \u201csome operational successes that are impressive,\u201d says Harold Tobin, a seismologist at the University of Washington. \u201cBut the most challenging events are the largest, and it is clear that the alert warning system didn\u2019t do all that one would hope for during the Turkey earthquake.\u201d<\/p>\n
After the 2023 Turkey-Syria earthquake, the Google team realized it had initially underestimated the magnitude. Warnings were sent to some people after the shaking had already begun, whereas others did not get alerts at all. In response, the Google team tweaked its algorithm, increasing the duration of the initial earthquake assessment period and removing phones that detect too much background shaking noise. The team also stopped sending alerts as vibrations because they would interfere with detecting aftershocks.<\/p>\n
The researchers then tested the new algorithm on the same data from the 2023 earthquake and found it would have performed much better. Some 10 million phones would have received a \u201ctake action\u201d alert, providing up to a 35-second warning, while a lesser \u201cbe aware\u201d alert would have been received by 67 million people in the region. In April, the updated algorithm was used to detect a magnitude 6 earthquake near Istanbul and issued alerts, says Richard Allen, a seismologist at the University of California, Berkeley and Google collaborator who was lead author of the new study. \u201cFor each earthquake detection, we are learning so that the algorithms do much better,\u201d adds Allen, who in 2018 helped unveil ShakeAlert, a traditional warning system serving the U.S. West Coast.<\/p>\n
The goal of the Google system is to supplement existing detection networks like ShakeAlert and to help residents in countries that might lack traditional seismic networks, Allen says. Although those goals are laudable, Tobin cautions that the Android system is not a replacement for a dedicated system. \u201cSome countries might choose not to spend money on developing a government-sponsored earthquake alert system because they think Android has them covered,\u201d he says.<\/p>\n
Others have concerns about the accessibility of data in a system that is controlled by a company rather than a public agency. Gavin Hayes, senior science adviser for the U.S. Geological Survey, encourages Google to continue to be open with its data, sharing how the system is performing with researchers and governments. \u201cThis article is really the first attempt for the system to provide publicly accessible information,\u201d Hayes says. \u201cIt would be great if this led to some kind of public archive.\u201d<\/p>\n
Ebru Bozda\u011f, a seismologist at the Colorado School of Mines, is interested in the potential for the Android system to identify earthquakes in remote regions without traditional seismometers.\u00a0In the end, however, earthquake early warnings will only go so far, she adds. Most earthquake risk comes from unreinforced buildings. Ultimately, she says, the way to reduce that risk \u201cis to improve the quality of buildings and make sure that they won\u2019t collapse.\u201d<\/p>\n
Fuente: <\/strong>https:\/\/www.science.org<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"En 2021, Google comenz\u00f3 a desplegar un sistema que no necesita en absoluto de una red s\u00edsmica tradicional. Aprovecha los diminutos aceler\u00f3metros de los tel\u00e9fonos… <\/p>\n","protected":false},"author":1,"featured_media":17344,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[36,35,28],"tags":[],"_links":{"self":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts\/17343"}],"collection":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=17343"}],"version-history":[{"count":1,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts\/17343\/revisions"}],"predecessor-version":[{"id":17345,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts\/17343\/revisions\/17345"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/media\/17344"}],"wp:attachment":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}