Find recent or historic earthquakes, lists, information on selected significant earthquakes, earthquake resources by state, or find webservices. The magnitude of an earthquake is the amount of energy released at the source of the earthquake and is measured by a seismograph. Earthquakes and tsunamis caused by low-angle normal faulting in the Banda Sea, Indonesia, Nature Geoscience (2020).DOI: 10.1038/s41561-020-0545-x Although the faults themselves do not rupture to the surface, the CRSB is marked along much of its length by an alignment of faultpropagation folds such as the Rumsey Hills. The authors conclude that their findings demonstrate that earthquake-induced sediment slumping can trigger large tsunamis, and that—in the Banda Sea—seismic activity in a region of extensional tectonics is a source of large earthquake and tsunami hazard for Indonesia. What is the Source of the Earthquake Earthquake is another destructive natural phenomenon. Earthquake - Earthquake - Properties of seismic waves: At all distances from the focus, mechanical properties of the rocks, such as incompressibility, rigidity, and density, play a role in the speed with which the waves travel and the shape and duration of the wave trains. However, they show up separately on the seismograph because they travel with different speeds. Earthquake information. The seismic rupture of the Mw 9.0 March 11, 2011 Tohoku-Oki earthquake (henceforth the Tohoku-Oki earthquake) was rather complex.