Most earthquakes generally originate from compressional or tensional
stresses built up at the margins of the huge moving plates known as
tectonic plates that make up the earth's surface.
The immediate cause of most shallow earthquakes like in Nepal now, occurring within 70 km of the surface, is the sudden release of stress along a fault, or fracture in the earth's crust, resulting in movement of the opposing blocks of rock past one another
The size or magnitude of earthquakes is determined by measuring the amplitude of the seismic waves, which depends on many factors such as the magnitude, distance from the epicentre, depth of focus, topography, and local ground conditions
The immediate cause of most shallow earthquakes like in Nepal now, occurring within 70 km of the surface, is the sudden release of stress along a fault, or fracture in the earth's crust, resulting in movement of the opposing blocks of rock past one another
The size or magnitude of earthquakes is determined by measuring the amplitude of the seismic waves, which depends on many factors such as the magnitude, distance from the epicentre, depth of focus, topography, and local ground conditions
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