A Comparison and Contrast of Earthquake in Haiti and Chile in 2010

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Introduction There are about 15 tectonic or lithospheric plates on the earth’s surface, which have different size and move relative to one another over the earth’s surface. As a result, the crust around the boundaries of the plates bends or deforms, accumulating strong energy during these processes (Briggs, 2006). When the strain becomes too great to bear by the crust in the future, the crust will snap or slip causing earthquakes. As a type of geophysical hazard, earthquakes are inevitable for mankind living on the Earth, which destroy tremendous buildings, and take human life away. However, influences of earthquakes can be reduced if people take appropriate actions. This report provide an overview of two earthquakes that happened in…show more content…
Earthquakes cause this fault to slip an average of 8 millimeters a year, with the remaining 12 millimeters a year of the Caribbean Plate's eastward motion being absorbed by a parallel fault system in northern Hispaniola (Bilham, 2010).
Precursor Pursuits
Earthquakes are inherently unpredictable. Even though many reports are published to illustrate the relationships between earthquakes and other things, such as foreshocks, surface bulges, animal behaviors. Reports about a variety of precursor signals are very hard to verify, because every earthquake is unique. The following part will introduce some funds from scientist before these two earthquakes.
Haiti
Sarkar, Choudhary, Sonakia, Vishwakarma, and Gwal (2012) indicates that electron density and temperature variation in the ionosphere might be precursors of earthquakes; they have some interesting founds about these two things during the Haitian earthquake. “There are several sensors onboard DEMETER (Detection of Electromagnetic Emissions Transmitted from Earthquake Regions) to survey the ionosphere. The electron density and temperature variation are studied using the Langmuir Probe Instrument (ISL)” (Sarkar et al., 2009, p.634). Based on the data from DEMETER and ISL, Sarkar et al. (2012) conclude that the electron density of plasma in ionosphere started increasing 5 days before the earthquake, and
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