earthquake warnings
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1. Distance between the earthquake source and the closest seismic network seismometer (station).
It takes a finite amount of time (3–4 miles per second) for the first seismic waves to travel from the source (e.g. the point on a fault that is breaking) to the seismic station. Therefore, the closer a station is to where an earthquake begins, the more rapidly the earthquake can be detected. Accurate detections often depend on multiple ground motion measurements from more than one station; so, increasing the density of stations near the fault can improve detection times.
2. Transfer of information to the regional networks.
Data from multiple stations is collected and analyzed by the regional seismic networks, so ground motion information must be transferred from the station to the processing center. Existing networks use a variety of methods to send data back to the server to improve robustness, including radio links, phone lines, public/private internet, and satellite links. In addition, delays from packaging and sending the data from the station must be minimized to provide useful warning times.
3. Detection and characterization of an earthquake.
Ground motion records received from the stations in real time are used to detect an earthquake and rapidly determine an initial location and magnitude of the event. We are developing multiple algorithms to estimate the earthquake information as rapidly as possible. Earthquakes can continue to grow in size over many seconds (the larger the earthquake generally the longer it takes to get to the final size), so magnitude estimates can also change through time as the evolving earthquake is tracked.
4. Shaking intensity threshold used to issue an alert.
Alerts are issued for a region when the expected ground shaking intensity is above a minimum threshold. Alerts can be provided more quickly for low thresholds of ground shaking because the system doesn’t need to wait as long for the earthquake magnitude to grow (larger earthquakes produce high ground shaking intensities).
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It takes a finite amount of time (3–4 miles per second) for the first seismic waves to travel from the source (e.g. the point on a fault that is breaking) to the seismic station. Therefore, the closer a station is to where an earthquake begins, the more rapidly the earthquake can be detected. Accurate detections often depend on multiple ground motion measurements from more than one station; so, increasing the density of stations near the fault can improve detection times.
2. Transfer of information to the regional networks.
Data from multiple stations is collected and analyzed by the regional seismic networks, so ground motion information must be transferred from the station to the processing center. Existing networks use a variety of methods to send data back to the server to improve robustness, including radio links, phone lines, public/private internet, and satellite links. In addition, delays from packaging and sending the data from the station must be minimized to provide useful warning times.
3. Detection and characterization of an earthquake.
Ground motion records received from the stations in real time are used to detect an earthquake and rapidly determine an initial location and magnitude of the event. We are developing multiple algorithms to estimate the earthquake information as rapidly as possible. Earthquakes can continue to grow in size over many seconds (the larger the earthquake generally the longer it takes to get to the final size), so magnitude estimates can also change through time as the evolving earthquake is tracked.
4. Shaking intensity threshold used to issue an alert.
Alerts are issued for a region when the expected ground shaking intensity is above a minimum threshold. Alerts can be provided more quickly for low thresholds of ground shaking because the system doesn’t need to wait as long for the earthquake magnitude to grow (larger earthquakes produce high ground shaking intensities).
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