seismograph ...
There were 22,289 recorded earthquakes in 2011 worldwide according to the USGS. However, the USGS estimates that several million earthquakes occur in the world each year and go undetected because they hit remote areas or have very small magnitudes.
Seismograph is the word for a device that records the movements of the earth, particularly earthquakes.
Scientists have not given earthquakes names as yet but the first recorded instance of someone using an earthquake intensity recording device was by a scientist by the name of Schiantarelli, who in 1783 recorded the intensity of an earthquake that happened in Calabrian, Italy.
The country with the most earthquakes is Japan. Japan sits on the Pacific Ring of Fire, a zone known for high seismic activity due to tectonic plate movements. This makes Japan prone to frequent earthquakes, including some of the most powerful in recorded history.
Earthquakes, by far, occur most frequently. On average, each year, there are about 1,800 tornadoes are recorded. The actual number of tornadoes is probably higher, most likely a few thousand, due to the many tornadoes that escape detection. By contrast, between five hundred thousand and 1 million earthquakes are recorded each year, of which 100,000 are strong enough to be felt.
Earthquakes are monitered by a device called a Richter Scale.
California has had many earthquakes, but no recorded hurricanes.
Seismology: the study of the vibrations from earthquakes, recorded on seismographs.
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Scientists recorded earthquakes as early as 780 BCE in ancient China, during the Zhou Dynasty. These early recordings were made by a device called a seismoscope created by the Chinese philosopher and scientist Zhang Heng.
pacific plate
over 9000!
chile has had about 1230
The device used for measuring earthquakes is called a seismometer.
There are on average 20,000 - 30,000 recorded earthquakes around the world each year according to the USGS.For significant earthquakes in 1999 see related link below. USGS keeps statistics of earthquakes by year and region.USGS Earthquake Hazards Program
This is not a record of a Magnitude 8 or Greater Earthquake during the year
recorded earthquakes.