A seismograph measures the ground movements continuously, but the interesting events - the earthquakes – are rare. With this program, we would like to find these events automatically.

Finds the beginning of the earthquake and displays the number of the entry. We say that there is an earthquake if the absolute value of the signal exceeds 20.0.

Looks for the end of the earthquake, and displays the number of the entry. The earthquake is said to be over if 200 consecutive values are below the threshold.

Calculates the energy of the earthquake, i.e. the sum of the square values (∑x²) between the beginning and the end.

Detects several earthquakes. For each earthquake, it displays its beginning, its length, and its energy.

(Originally an exercise done at University of Fribourg: https://sop.course-unifr.ch/#earthquakes)