вЂњThe expectation has been that such information would improve alerting because it would offer a better characterization of large earthquake sources compared to a point source,вЂќ Murray explained. But researchers are already looking at ways to incorporate 3D source information, gleaned from fault displacement data collected by Global Navigation Satellite Systems (GNSS), into ShakeAlert. West CoastвЂ™s ShakeAlert, the researchers note in theВ Bulletin of the Seismological Society of America.ДЇor now, ShakeAlertвЂ™s algorithms use seismic data to characterize an earthquake source as a point or line. The studyвЂ™s findings could be useful for earthquake early warning systems like the U.S. In their study, 3D models also substantially improved alert accuracy for all subduction zone earthquakes at MMI 4.5 and MMI 2.5 (weak motion felt only by a few people) thresholds. They suggest 3D models would be an improvement over 2D models for an alert threshold of MMI 4.5, meaning that the alert would be triggered for shaking exceeding the вЂњlightвЂќ intensity category, where most people indoors would feel some shaking. The benefits of 3D fault models vary depending on the fault style (a strike slip versus a reverse fault, for instance), whether the event is a subduction or crustal earthquake, and the level of shaking that triggers the alert, say Jessica Murray and colleagues at the U.S.

Three-dimensional fault models are generally more accurate than two-dimensional line models at sending ground shaking alerts to the correct areas as part of an earthquake early warning system, according to a new study.

Real 3d earthquake information