Many nations have developed systems for alerting people seconds before shaking begins. Even in countries like Venezuela that do not have such systems, Google Android Earthquake Alerts can send warnings.<\/p>\n
Here\u2019s what to know:<\/p>\n
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Many nations have developed systems for alerting people seconds before shaking begins. Negro Elkha \u2013 stock.adobe.com<\/p>\n
Warning systems are used around the world<\/p>\n
Several countries have Early\u00a0Earthquake\u00a0Warnings \u2014 sometimes shortened to EEW \u2014 including the United States, Mexico, Japan, Turkey, Romania, China, Italy and Taiwan, according to the U.S. Geological Survey.<\/p>\n
Venezuela\u00a0does not have a national EEW. Wednesday evening\u2019s back-to-back 7.2- and 7.5-magnitude earthquakes<\/a> were among the strongest to strike the country in more than a century.<\/p>\n Still, some people in Venezuela received warnings seconds or even minutes before the shaking began through Google\u2019s Android Earthquake Alerts system.<\/p>\n Though Venezuela does not have a national Early Earthquake Warnings system, some people received warnings seconds or even minutes before the shaking began through Google\u2019s Android Earthquake Alerts system. Getty Images<\/p>\n The warning system relies on crowdsourced data from the sensors in individual cellphones to detect seismic events and send warnings to other phone users in the area. It has greatly expanded since it rolled out in 2020 with 250 million people receiving alerts in 2020, to over 2.5 billion today, according to Richard Allen, director of the Berkeley Seismology Lab.<\/p>\n It alerts about 60 earthquakes each month to an average of 18 million phones, according to Allen\u2019s website.<\/p>\n Pericles S\u00e1nchez, a 39-year-old Venezuelan writer in Caracas, received an earthquake warning on his Android phone minutes before the earthquake reached his home, allowing him time to run outside. S\u00e1nchez said his family\u2019s house was not damaged.<\/p>\n \u201cIt wasn\u2019t until we were already outside that we started to feel it,\u201d S\u00e1nchez said.<\/p>\n Diogenes L\u00f3pez, 36, a Venezuelan migrant, said an earthquake alert app on his phone alerted him of the quakes in his homeland even though he now lives in Bogota, Colombia. Having previously lived in Chile, where earthquake warning systems are widely used, he immediately zoomed in on the map and realized the epicenter was near his hometown.<\/p>\n \u201cMy mind went straight to the worst,\u201d L\u00f3pez said. \u201cAll my family is there.\u201d<\/p>\n His sister eventually managed to send a message saying the family was safe.<\/p>\n \u201cVenezuela doesn\u2019t have the earthquake culture you see in countries like Chile or Japan. People aren\u2019t used to these kinds of events and don\u2019t always know how to react,\u201d he said, adding that he worried Venezuela\u2019s deteriorating buildings would not withstand much.<\/p>\n Earthquake warning systems are fairly new<\/p>\n On the U.S. West Coast, the USGS operates an early warning system called ShakeAlert for California, Oregon and Washington that alerts in multiple ways, including through a California-run app called MyShake. Launched in 2019, it has since sent 6.8 million alerts for 194 earthquakes.<\/p>\n Over 4 million people were alerted to Wednesday\u2019s quake, said Robert de Groot, a USGS scientist.<\/p>\n \u201cIt\u2019s always good to have more than one way of getting alerts. It\u2019s the reason why you carry a spare tire in your car or carry some small bills in your wallet because the ATM may not work,\u201d he said.<\/p>\n The first public EEW was launched in 1991 in Mexico, and today people are warned of\u00a0large quakes\u00a0through broadcast stations, phone apps and public alarm systems. Mexico City also holds\u00a0earthquake drills\u00a0to practice how to respond to an earthquake.<\/p>\n Japan expanded its\u00a0earthquake warning system\u00a0to cover the ocean floor after the\u00a0magnitude 9.0 earthquake\u00a0and tsunami in 2011 that killed more than 22,000 people and triggered a\u00a0catastrophic meltdown\u00a0of the Fukushima Daiichi nuclear power plant.<\/p>\n Japan\u2019s Seafloor Observation Network for Earthquakes and Tsunamis, or S-Net, uses thousands of miles of underwater cables and sensors to directly monitor the offshore subduction zone where tectonic plates meet. The system is considered the most sophisticated in the world, and it has increased warning times for earthquakes by about 20 seconds, and made tsunami warnings as much as 20 minutes faster.<\/p>\n The U.S. Geological Survey operates an early warning system called ShakeAlert for California, Oregon and Washington that alerts in multiple ways, including through a California-run app called MyShake, which was launched in 2019. Kirby Lee-USA TODAY Sports<\/p>\n Most systems rely on sensors and cellphones or public alarms<\/p>\n Earthquakes generate a few types of movement \u201cwaves:\u201d P-waves travel fastest and cause smaller vibrations in the earth. Larger, slower S-waves come next, creating more dangerous earth-shaking movements. L-waves come last and are the most destructive.<\/p>\n Google\u2019s Android earthquake warning system relies on the accelerometers in individual cellphones, which are the same sensors that flip the screen when a phone is turned sideways. If a stationary Android phone detects a P-wave, it sends a signal to Google\u2019s detection center, which then analyzes data from other phones in the region. That crowdsourced data is used to confirm the earthquake and send alerts.<\/p>\n Most EEWs use seismometers and other sensors to detect those waves, and then transmit that information to regional networks where the data is used to determine an initial location and estimated magnitude within seconds. If the intensity of the earthquake reaches a certain threshold, alerts go out to the areas likely to be affected.<\/p>\n In the U.S., those alerts are sent through multiple means including the public Wireless Emergency Alert system, various phone apps or regional public warning systems.<\/p>\n Some people might get multiple alerts for the same event, and others \u2014 particularly those in rural areas \u2014 might not get any.<\/p>\n The closer to the quake, the shorter the warning time<\/p>\n The electronic signals used to detect the shaking and transmit the warnings move at the speed of light, much faster than seismic waves can travel through the ground. It\u2019s sort of like a rainstorm \u2014 the further away someone is from a lighting strike, the longer it will take before they hear the accompanying thunder.<\/p>\n People closest to the epicenter will get the shortest warning times, or may not even get the warning until heavy shaking has already begun. People farther away may have more time to prepare \u2014 though it\u2019s typically only seconds.<\/p>\n Download The California Post App, follow us on social, and subscribe to our newsletters <\/p>\n California Post News: Facebook<\/a>, Instagram<\/a>, TikTok<\/a>, X<\/a>, YouTube<\/a>, WhatsApp<\/a>, LinkedIn<\/a>![\"Though](\"https:\/\/www.newsbeep.com\/us-ca\/wp-content\/uploads\/2026\/06\/d8c1bb9e6db565228cf189241b4626a5.jpeg\"\/)
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