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Scientists find telling early moment that indicates a megaquake is coming

Just 10 seconds into a quake, GPS data can detect signs of acceleration that point to the event's magnitude
by TR Pakistan

Scientists combing through databases of earthquakes since the early 1990s have discovered a possible defining moment 10-15 seconds into an event that could signal a magnitude 7 or larger megaquake.

The moment – gleaned from GPS data on the peak rate of acceleration of ground displacement – can also indicate a smaller event. GPS picks up an initial signal of movement along a fault similar to a seismometer detecting the smallest first moments of an earthquake.

According to Diego Melgar, a professor in the Department of Earth Sciences at the University of Oregon, such GPS-based information potentially could enhance the value of earthquake early warning systems such as the West Coast’s ShakeAlert.

Read more: The Science of Earthquakes

The physics-heavy analyses of two databases maintained by co-author Gavin P. Hayes of the U.S. Geological Survey’s National Earthquake Information Center in Colorado detected a point in time where a newly initiated earthquake transitions into a slip pulse where mechanical properties point to magnitude.

Melgar and Hayes also were able to identify similar trends in European and Chinese databases. Their study was detailed in the May 29 issue of the online journal Science Advances.

“To me, the surprise was that the pattern was so consistent,” said Melgar in a press release issued by the university. “These databases are made different ways, so it was really nice to see similar patterns across them.”

Scientists have found in GPS data a telling window that begins 10 seconds into an earthquake. In four sample events (colored lines), the acceleration of peak ground displacement (measurements shown at right) just five seconds later suggests whether a megaquake, such as a magnitude 9 (red X) or a sub-7 magnitude quake is in progress. Real time monitoring, the researchers say, could enhance earthquake early warning. Credit: University of Oregon

The databases contain information about more than 3,000 earthquakes. Consistent indicators of displacement acceleration that surface between 10-20 seconds into events were seen for 12 major earthquakes occurring in 2003-2016.

GPS monitors exist along many land-based faults, including at ground locations near the 620-mile-long Cascadia subduction zone off the U.S. Pacific Northwest coast, but their use is not yet common in real time hazard monitoring. GPS data shows initial movement in centimeters, noted Melgar.

“We can do a lot with GPS stations on land along the coasts of Oregon and Washington, but it comes with a delay,” he said. “As an earthquake starts to move, it would take some time for information about the motion of the fault to reach coastal stations. That delay would impact when a warning could be issued. People on the coast would get no warning because they are in a blind zone.”

Read more: 12 Years After the October Earthquake, Is Pakistan Prepared to Handle Another ‘Big One’?

This delay would only be ameliorated by sensors on the seafloor to record this early acceleration behavior.Having these capabilities on the seafloor and monitoring data in real time could strengthen the accuracy of early warning systems.

In 2016, Melgar, as a research scientist at Berkeley Seismological Laboratory in Berkeley, California, led a study published in Geophysical Research Letters that found real time GPS data could provide an additional 20 minutes of warning of a possible tsunami.

Japan already is laying fiber optic cable off its shores to boost its early warning capabilities, but such work is expensive and would be more so for installing the technology on the seafloor above the Cascadia fault zone.

 

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