The term intraplate earthquake refers to a variety of earthquake that occurs within the interior of a tectonic plate; this stands in contrast to an interplate earthquake, which occurs at the boundary of a tectonic plate. Intraplate earthquakes are often called "intraslab earthquakes," especially when occurring in microplates.
Soil liquefaction occurs when a cohesionless saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress such as shaking during an earthquake or other sudden change in stress condition, in which material that is ordinarily a solid behaves like a liquid. In soil mechanics, the term "liquefied" was first used by Allen Hazen in reference to the 1918 failure of the Calaveras Dam in California. He described the mechanism of flow liquefaction of the embankment dam as:
If the pressure of the water in the pores is great enough to carry all the load, it will have the effect of holding the particles apart and of producing a condition that is practically equivalent to that of quicksand... the initial movement of some part of the material might result in accumulating pressure, first on one point, and then on another, successively, as the early points of concentration were liquefied.
The 2008 Lake Kivu earthquake shook several countries in Africa's Great Lakes region at 07:34:12 (GMT) on February 3. It measured 5.9 on the moment magnitude scale. The epicentre was 20 kilometres (12 mi) north of Bukavu at Lake Kivu in the Democratic Republic of Congo.
The Dead Sea Transform (DST) fault system, also sometimes referred to as the Dead Sea Rift, is a series of faults that run for about 1,000 km from the Maras Triple Junction to the northern end of the Red Sea Rift. The fault system forms the transform boundary between the African Plate to the west and the Arabian Plate to the east. It is a zone of left lateral (sinistral) displacement, signifying the relative motions of the two plates. Both plates are moving in a general north-northeast direction, but the Arabian Plate is moving faster, resulting in the observed left lateral motions along the fault of approximately 107 km at its southern end. A component of extension is also present in the southern part of the transform, which has contributed to a series of depressions, or pull-apart basins, forming the Gulf of Aqaba, Dead Sea, Sea of Galilee, and Hula basins. A component of shortening affects the Lebanon restraining bend, leading to uplift on both sides of the Beqaa valley. There is local transtension in the northernmost part of the fault system, forming the Ghab pull-apart basin. The fault system runs roughly along the political border of Israel, Jordan, and Lebanon.
The 1989 Malawi earthquake occurred on 10 March in central Malawi, with a moment magnitude of 6.3 and a maximum Mercalli intensity of VIII (Severe). It was preceded by a number of foreshocks, the largest being a 5.7 shock on the previous day. The earthquake was felt strongly throughout central Malawi, and also felt in parts of Mozambique and Zambia. Nine people were killed, with many others injured or left homeless.
The 1783 Calabrian earthquakes were a sequence of five strong earthquakes that hit the region of Calabria in southern Italy, the first two of which produced significant tsunamis. The epicenters form a clear alignment extending nearly 100 km from the Straits of Messina to about 18 km SSW of Catanzaro. The epicenter of the first earthquake occurred in the plain of Palmi. The earthquakes occurred over a period of nearly two months, all with estimated magnitudes of 5.9 or greater. Estimates of the total number of deaths lie in the range 32,000 to 50,000.
Slab pull is a geophysical mechanism whereby the cooling and subsequent densifying of a subducting tectonic plate produces a downward force along the rest of the plate. In 1975 Forsyth and Uyeda used the inverse theory method to show that, of the many forces likely to be driving plate motion, slab pull was the strongest. Plate motion is partly driven by the weight of cold, dense plates sinking into the mantle at oceanic trenches. This force and slab suction account for almost all of the force driving plate tectonics. The ridge push at rifts contributes only 5 to 10%.
The 1964 Niigata earthquake struck at 13:01 local time on 16 June with a magnitude of either 7.5 or 7.6. The epicenter was on the continental shelf off the northwest coast of Honshu, Japan, in Niigata Prefecture, about 50 kilometres (31 mi) north of the city of Niigata. The earthquake caused liquefaction over large parts of the city.
The Sagaing Fault is a major fault in Myanmar, a mainly continental right-lateral transform fault between the Indian Plate and Sunda Plate. It links the divergent boundary in the Andaman Sea with the zone of active continental collision along the Himalayan front. It passes through populated cities of Mandalay, Yamethin, Pyinmana, the capital Naypyidaw, Toungoo and Pegu before dropping off into the Gulf of Martaban, running for a total length of over 1200 kilometers.
The 2016 Oklahoma earthquake occurred on September 3, 2016 near Pawnee, Oklahoma. Measuring 5.8 on the moment magnitude scale, it is the strongest in state history. At 5.8 magnitude, this ties it with the 2011 Virginia earthquake, which was determined after it struck to be the most powerful quake in the eastern United States in the preceding 70 years.
The 1847 Zenkoji earthquake occurred at about 21:30 local time on 8 May at Nagano, Japan. It had a magnitude of 7.4 on the surface wave magnitude scale. It caused the destruction of many houses in Nagano and at least 8,600 people were killed. The earthquake triggered many landslides, the largest of which dammed the Sai River. 19 days later, the failure of this earthquake dam caused a flood that destroyed many more houses and killed 35 people.
Estella Atekwana is a geophysicist studying biogeophysics and tectonophysics. She is currently Dean of the College of Letters and Science at University of California, Davis. She previously served as Dean of the College of Earth, Ocean and Environment at the University of Delaware. She is also an adjunct professor at both the University of Waterloo and the Missouri University of Science and Technology. Before joining the University of Delaware in 2017, she was the Department Head of the Boone Pickens School of Geology at Oklahoma State University. She is a Regents Distinguished Professor and a Clyde Wheeler Sun Endowed Chair at Oklahoma State University, where she maintains an adjunct appointment. Atekwana has also been a faculty member at Missouri University of Science & Technology, Indiana University-Purdue University Indianapolis, and Western Michigan University. Atekwana has been apart of helping write many journals and has earned many awards and honors throughout her career.
The Canadian Arctic Rift System is a major North American geological structure extending from the Labrador Sea in the southeast through Davis Strait, Baffin Bay and the Arctic Archipelago in the northwest. It consists of a series of interconnected rifts that formed during the Paleozoic, Mesozoic and Cenozoic eras. Extensional stresses along the entire length of the rift system have resulted in a variety of tectonic features, including grabens, half-grabens, basins and faults.
The Afyon Province of western Turkey was struck by an earthquake measuring 6.5 on 3 February 2002 at 10:11 local time. It had a maximum felt intensity of VIII (Severe) on the Modified Mercalli intensity scale. It damaged hundreds of buildings and caused the deaths of 44 people and a further 318 injuries.
In 1954, the state of Nevada was struck by a series of earthquakes that began with three magnitude 6.0+ events in July and August that preceded the Mw 7.1–7.3 mainshock and M 6.9 aftershock, both on December 12. All five earthquakes are among the largest in the state, and the largest since the Cedar Mountain earthquake of 1932 and Pleasant Valley event in 1915. The earthquake was felt throughout much of the western United States.
The 1626 Lingqiu earthquake had an epicentre in Lingqiu County, Shanxi Province during the Ming dynasty. The estimated surface wave magnitude (Ms ) 7.0 earthquake caused many buildings to collapse. Over 5,200 people were killed.
The Ungava Fault Zone, also called the Ungava Transform Fault Zone and the Ungava Fault Complex, is a major strike-slip fault system in Davis Strait between Baffin Island and Greenland. Its faults are oriented northeast–southwest and were tectonically active in the Paleogene, during which time the fault zone formed a boundary between the Greenland and North American plates. The Ungava Fault Zone connects the Baffin Basin in the north with the Labrador Basin in the south.
