An earthquake early warning system that usesartificial intelligence(AI) to predict how the ground will move during a temblor can give several seconds' advance notice that the shaking is coming.
在美国西海岸上已经存在了一种使用更传统的计算能力的类似系统。它被称为Shakealert，它通过检测地震运动的第一波来说，称为P波 - 然后计算导致大部分摇动的波浪的一组波 - 将到达。
The new system in development is called DeepShake, and it is also intended to provide a few seconds' warning of imminent shaking once an earthquake has started. However, DeepShake uses a deep neural network, a type of AI learning, to identify patterns from past地震为了预测如何从新的地震震动将如何旅行。这可能导致在不同地震易发地区的加工速度更快和更容易普遍。
"When we set out on this project our goal was to beat the ground motion prediction equations that are currently used" to program shake-alert systems, said Avoy Datta, a master's student in electrical engineering at Stanford University who was part of the team that developed DeepShake. "They tend to be very slow. You need numerical solvers, running on supercomputers, and they can take minutes and hours to process."
In contrast, "If we run 25 DeepShake models, it takes around 6.1 milliseconds on a single research GPU [graphics processing unit]. " Datta told Live Science. “This is going to be blazing fast.”
Datta, Wu and their colleagues used this earthquake sequence to train DeepShake to predict ground shaking in the area. They started with a dataset of more than 36,000quakes that struck Ridgecrestfrom July to September 2019 (most were quite tiny). They fed 80% of the dataset into the deep neural network, saving 10% for tweaking the parameters of the network and a final 10% for testing whether the network's outcomes matched reality.
The researchers programmed the network to assign more weight to the larger earthquakes in the sequence, which were relatively few, so that it could perform better as an early warning system — after all, the largest quakes are the ones that people need warning about the most.
Despite the fact that DeepShake was given no information about the earthquake's location or type, it was able to warn of shaking at other seismic stations in the network between 3 and 13 seconds before it happened, Wu told Live Science. This is similar to the amount of advanced notice with ShakeAlert. Wu and Datta don't view this other system as a competitor, however. Rather, they said, DeepShake technology could be used to complement ShakeAlert. The researchers hope to expand the testing to other faults and earthquake sequences.
Originally published on Live Science.