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Small movements of the Earth's crust that may not be felt are called seismic micro tremors or micro earthquakes. These are typically too weak to be detected by humans but can be recorded by seismographs.
They are called aftershocks, or tremors.
Seismic waves or tremors
Aftershock
California experiences thousands of seismic tremors each year, with many of them too small to be felt by people. However, on average, there are around 15,000 earthquakes annually in California, though the majority are minor in magnitude.
Earth tremors
The vibrational tremors sent out from an earthquake are known as seismic waves. These waves travel through the Earth's crust and are responsible for the shaking felt during an earthquake. There are two main types of seismic waves: primary (P-waves) and secondary (S-waves).
because japan was a good allie and they were friends of russia. they had mated before and felt they were obliged to help each other.
Yes, earthquakes happen every day around the world, but most are very minor and go unnoticed. The Earth experiences thousands of earthquakes each year, with a majority of them being too small to be felt.
Japan just felt like it.
Places that are not along fault lines planes* in the earth would have very few earthquakes. +++ In particular, places far from subduction zones, in which one of the Earth's crustal plates is being forced down below another. *A fault plane is the fracture with displacement itself. Its line is the trace of the fault plane's intersection with the land surface. There are no places on Earth that experience absolutely no earthquakes.