What is a seisometer?

A seisometer is a machine that you put on a volcano.It measures its sound so you know when it it going to erupt.Mt.Vesuvius has a seisometer.It needs one because there are over one and a half million people living in the "danger zone" in Pompeii. Volcanoes are either:active,extinct or dormat.
By Smiley



Ocean-bottom Seisometer (OBS)
An Ocean-Bottom Seisometer is a aluminium sphere of about 17 inches and are often bright orange or yellow in colour.Generally found on the seabed,but sometimes can break free from their anchorings and can drift ashore,but they pose no danger to the public or wildlife in the area.The seisometer is commonly used as a geoghysical instrument and are used in the Irish sea to measure movements in the oceanic plates.
By Smiley