The tremor hit at a depth of around 60 miles, the agency said. The quake appears to have struck between Indonesia’s Maluku and Timor Leste.
Residents in the area said they were awoken by shaking beds and buildings, and they were forced to flee.
“Because of the logarithmic basis of the scale, each whole-number increase in magnitude represents a tenfold increase in measured amplitude; as an estimate of energy, each whole number step in the magnitude scale corresponds to the release of about 31 times more energy than the amount associated with the preceding whole number value,” the agency’s website says.
Indonesia and other Pacific island nations are located on the Ring of Fire, which is an especially earthquake-prone region that encircles the Pacific Ocean. Other than earthquakes and tsunamis, the region also experiences a number of volcanic eruptions.
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