INGV Terremoti

The official application of the National Institute of Geophysics and Volcanology.

This is the official application of the National Institute of Geophysics and Volcanology (INGV) which shows the data relating to the most recent earthquakes that occur on Italian territory and, limited to the strongest events, in the rest of the world.

The parameters (origin time, epicentral coordinates, depth and magnitude) of earthquake locations are available thanks to the INGV Seismic Surveillance Service, active 24 hours a day, 7 days a week.

The parameters are subject to change as new data becomes available.

Particular attention was paid to scientific information regarding earthquakes; in fact, there are sections connected to the INGVterremoti blog ingvterremoti.com.

NEW PUSH NOTIFICATIONS

We have enabled push notifications for earthquakes with a magnitude greater than 2.5.

Notifications are customizable by the user.

Notifications are available for final and automatic localizations at the following times.

The signals, i.e. the seismograms, from the over 400 stations of the National Seismic Network and other networks that contribute to it arrive in real time in the Seismic Surveillance Room of the INGV in Rome. The signals are all digital and managed by dedicated software. When a certain minimum number of stations registers an earthquake, the computer systems used associate the signals with each other and attempt to calculate the hypocentral location and determine the magnitude. During this operation, which can take 1 or 2 minutes, the quality of the determination is also evaluated with quantitative parameters.

If these parameters show sufficient quality and for events with a magnitude greater than 3, INGV communicates the automatic preliminary data through the app in an orange box above the list of earthquakes, indicating that this is information not verified with the indication [PROVISIONAL ESTIMATE]. In this case, the magnitude is provided with a range of values ​​and the area is indicated with the zone or province within which the epicenter falls.

Meanwhile, the seismologists, who work shifts 24 hours a day, begin reviewing the location and magnitude: they analyze the individual signals, verify that the software has worked correctly in identifying the arrival of the P waves and S waves and in calculating the maximum amplitudes. At the end of the review, the hypocentral position (latitude, longitude, depth) is recalculated and the magnitude is re-estimated. Depending on the magnitude of the earthquake – and therefore the number of seismic stations that recorded it – and the geological complexities of the affected region, it can take up to 30 minutes to complete the review.

Within the app, the revised location data is inserted into the list of seismic events and at the same time the corresponding orange box of the provisional estimate disappears.

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HOURS

In the Latest earthquakes section, the times of seismic events are **no longer** expressed using the UTC reference time (Coordinated Universal Time) but the time in which the telephone is configured.

CHARACTERISTICS

The App allows you to view the latest earthquakes that occurred in the previous 3 days.

The App also allows you to view Italian seismicity from 2005 onwards, via the Earthquake Research section. You can search for earthquakes:

- for the last 20 days or in a selected time interval.

- all over the world, throughout Italy, closest to the current position, around a municipality, and finally by entering specific coordinate values.

- with magnitude values ​​within a selected range.

Particular attention was paid to scientific information regarding earthquakes; in fact, there are sections connected to the INGVterremoti blog ingvterremoti.com.