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The analysis includes its magnitude, origin time and date of the earthquake and the location of its hypocentre. They particularly occur around the edge of the Pacific Plate, for example in New Zealand, Vanuatu, the Solomon Islands, Papua New Guinea, Japan and the Americas, and in Indonesia, where the Indo-Australian Plate collides with the Eurasian Plate.
Smaller earthquakes that are not detected by many seismometers are difficult to locate in real-time and, consequently, are located by Seismic Analysts using computer programs. Chimneys, factory stacks, monuments, towers, and elevated tanks twisted or brought down. The depths of focus in these collision zones can range from 0-700 km.
Seismographs, such as the Teledyne Geotech Helicorder pictured, were used in the past to detect earthquake activity and relied on a mechanical system to record the seismic energy in the Earth onto paper.
In contrast, modern seismometers detect and convert any small movement in the Earth into an electrical signal for use in computer systems, as shown in the digital seismogram image of five seismic sensors which detected the magnitude 5.4 earthquake near Moe in Victoria on 19 June 2012.
An earthquake alert is then sent to Geoscience Australia’s partner in the JATWC, the Australian Bureau of Meteorology, to determine tsunami advice and publish tsunami bulletins. They are most common at tectonic plate boundaries where different plates meet.
The parameters of all other earthquakes with a magnitude greater than 3.5 are generally computed within 20 minutes. Frame houses not secured to the foundation may move. Landslips in roadside cuttings and unsupported excavations. The largest events usually happen where two plates are colliding, or colliding and sliding past one another.
which means to shake or move violently and was later applied to the science and equipment associated with earthquakes.The size or magnitude of earthquakes is determined by measuring the amplitude of the seismic waves recorded on a seismograph and the distance of the seismograph from the earthquake.These are put into a formula which converts them to a magnitude, which is a measure of the energy released by the earthquake.A magnitude 8.6 earthquake releases energy equivalent to about 10 000 atomic bombs of the type developed in World War II.Fortunately, smaller earthquakes occur much more frequently than large ones and most cause little or no damage.