Why do some earthquakes split the ground open?
Quick Answer
Strong shaking or fault movement can tear the crust apart if the ground is already under tension or sits on unstable deposits. The cracks are a surface expression of deeper rupture or liquefaction-related deformation.
The Full Story
Ground fissures can open when an earthquake stretches the crust, breaks surface sediments, or causes land to settle unevenly. Near the fault, the rupture may reach the surface directly and create visible cracks. In other places, saturated soils can weaken during shaking and deform, producing fissures and lateral spreading. These cracks are not always the main fault itself, but they can be a dangerous sign that the ground has been heavily disturbed. Large historic earthquakes, including the 1906 San Francisco earthquake, produced dramatic surface ruptures.
Key Facts
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