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Earthquakes exhibit diverse characteristics. Most shallow earthquakes are "brittle" in the sense that they excite seismic waves efficiently. However, some earthquakes are slow, as characterized by tsunami earthquakes and even slower events without any obvious seismic radiation. Also, some earthquakes, like the 1994 Bolivian deep earthquake, involved a large amount of fracture and thermal energy and may be more appropriately called a thermal event, rather than an earthquake. Some earthquakes aredoi:10.2183/pjab.80.297 fatcat:t3bti7fgcjd5jnnh4jzelc5pcy