Rossi–Forel scale

The Rossi–Forel scale was one of the first seismic scales to reflect earthquake intensities. Developed by Michele Stefano Conte de Rossi of Italy and François-Alphonse Forel of Switzerland in the late 19th century, it was used for about two decades until the introduction of the Mercalli intensity scale in 1902.

The Rossi–Forel scale and/or its modifications is still in use in some countries, such as the Philippines.

The 1873 version of the Rossi–Forel scale had 10 intensity levels:

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