3. You go for a jog on a beach and choose to run near the water, where the sand is well packed and solid under your feet. With each step, you notice that your footprint quickly fills with water, but not water coming in from the ocean. What is this water’s source? For what earthquake-related hazard is this phenomenon a good analogy?

As you jog along the beach close to the seashore, you feet exert pressure on the sand on the seashore. Although the sand on the seashore is well packed together and appear solid under your feet, the pressure exerted on them as you jog causes displacements between the particles of sand, thus forcing water out of the surrounding (remember its a beach, with water just underneath the surface) to fill your footprints

This phenomenon is similar to to the earth-quake related hazard known as Soil Liquefaction.

Soil liquefaction occurs when the soil, which normally is tightly packed and solid, starts behave like a liquid when external force or pressure is applied to it. This displaces the sand particles causing them to lose strength and start to 'flow' like a liquid/ The external pressure is usually from an earthquake

topeadeniran2 topeadeniran2 · Answer 2 · 2021-11-18T17:08:51+01:00

The earthquake-related hazard that the phenomenon is a good analogy to is soil liquefaction.

Liquefaction simply refers to the phenomenon where the strength and stiffness of soil will be reduced through an earthquake or rapid loading.

It should be noted that liquefaction has been responsible for tremendous damage in historical earthquakes. It should be noted that the water source illustrated in the question comes from displaced sand particles.

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