Earthquake is a term used to describe both sudden slip on a fault, and the resulting ground shaking and radiated seismic energy caused by the slip, or by volcanic or magmatic activity, or other sudden stress changes in the earth.
The magnitude is a number that characterizes the relative size of an earthquake. Magnitude is based on measurement of the maximum motion recorded by a seismograph.
A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage. The electrical voltage is recorded on paper, magnetic tape, or another recording medium. This record is proportional to the motion of the seismometer mass relative to the earth, but it can be mathematically converted to a record of the absolute motion of the ground. Seismograph generally refers to the seismometer and its recording device as a single unit.
Aftershocks are earthquakes that follow the largest shock of an earthquake sequence. They are smaller than the mainshock and within 1-2 rupture lengths distance from the mainshock. Aftershocks can continue over a period of weeks, months, or years. In general, the larger the mainshock, the larger and more numerous the aftershocks, and the longer they will continue.
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ICR.org (17 Important Earthquakes Recorded In The Bible)
Luke 21:11 - And great earthquakes shall be in divers places, and famines, and pestilences; and fearful sights and great signs shall there be from heaven.
Mark 13:8 - For nation shall rise against nation, and kingdom against kingdom: and there shall be earthquakes in divers places, and there shall be famines and troubles: these [are] the beginnings of sorrows.
Revelation 11:13 - And the same hour was there a great earthquake, and the tenth part of the city fell, and in the earthquake were slain of men seven thousand: and the remnant were affrighted, and gave glory to the God of heaven.
Matthew 24:7 - For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in divers places.
Psalms 60:2 - Thou hast made the earth to tremble; thou hast broken it: heal the breaches thereof; for it shaketh.
Acts 16:26 - And suddenly there was a great earthquake, so that the foundations of the prison were shaken: and immediately all the doors were opened, and every one's bands were loosed.
Revelation 6:12-14 - And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood; Rev 6:13 And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind. Rev
6:14 And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places.
Revelation 16:18 - And there were voices, and thunders, and lightnings; and there was a great earthquake, such as was not since men were upon the earth, so mighty an earthquake, [and] so great.
Matthew 28:2 - And, behold, there was a great earthquake: for the angel of the Lord descended from heaven, and came and rolled back the stone from the door, and sat upon it.
Isaiah 24:19 - The earth is utterly broken down, the earth is clean dissolved, the earth is moved exceedingly.
Matthew 24:36 - But of that day and hour knoweth no [man], no, not the angels of heaven, but my Father only.
Ezekiel 38:19 - For in my jealousy [and] in the fire of my wrath have I spoken, Surely in that day there shall be a great shaking in the land of Israel;
Hebrews 12:26 - Whose voice then shook the earth: but now he hath promised, saying, Yet once more I shake not the earth only, but also heaven.