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Why does the reported magnitude of an earthquake change?



Staff of the Puerto Rico Seismic Network posted on his Facebook portal An explanation of why the magnitude of a telluric movement changes over time.

According to the entity, when a seismometer records an earthquake, the signal from the instruments is received by the automatic detection system. Then, an analyst performs a review with a reading of magnitude, epicenter and initial depth and sends the information, known as a preliminary reading, as quickly as possible to the relevant government agencies and other emergency management groups.

Once the preliminary reading occurs, the analyst re-studies the original information and complements it with the data collected by other sensors and seismometers that recorded the event.

As part of this updated reading, the analyst enters the original information and that of all available sensors into a specialized computer program that helps determine more accurately the magnitude, location of the epicenter and the depth at which the earthquake occurred.

The analyst then sends this second updated reading to all relevant entities. It is for this reason that the information between the preliminary reading and the updated reading (s) may vary for the same event.

In its writing, the Seismic Network added that if there is a danger of a seaquake (tsunami), alerts will be considered as updated even if the tremor information stays the same. “The information from the tsunami alert will be updated every half hour,” the entity said.

Finally, the Seismic Network added that “the tsunami alert refers to the tsunami danger message. This message can be a warning, a warning, a surveillance or a cancellation.”

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