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2019 Cotabato Earthquakes
The 2019 Cotabato earthquakes were an earthquake swarm which struck the province of Cotabato on the island of Mindanao in the Philippines in October 2019. Three of these earthquakes were above 6.0 on the moment magnitude scale with a Modified Mercalli intensity scale, Mercalli intensity of VIII. More than 40 people have been reported dead or missing and nearly 800 were injured as a result of these events. Tectonic setting Mindanao lies across the complex convergent boundary between the Sunda Plate and the Philippine Sea Plate. Part of the oblique convergence between these plates is taken up by subduction along the Cotabato Trench. The strike-slip component of the convergence is accommodated partly by the Philippine Fault System and partly by the Cotabato Fault System, a network of mainly NW-SE trending sinistral (left-lateral) strike-slip faults that form the boundary between the Cotabato Arc and the Central Mindanao Volcanic Belt. In the area of the October 2019 earthquakes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tulunan, Cotabato
Tulunan, officially the Municipality of Tulunan ( ceb, Lungsod sa Tulunan; tl, Bayan ng Tulunan; mdh, Inged nu Tulunan, Jawi Alphabet, Jawi: ايڠايد نو تولونن), is a 2nd class municipality of the Philippines, municipality in the Philippine Province, province of Cotabato, Philippines. According to the 2020 census, it has a population of 60,978 people. History The Tulunan is derived from a Maguindanaon word “''tulun''” which means “a place of abundance” or “where grace fall”. The early settlers of the place were mostly Muslim tribes who settled in the lowlands. The nomadic tribes like the B'laans, Bagobos and Tirurays occupied the hills and mountains. The first system of government was datuism and the first ruling datu of the place was believed to be Datu Enok. During the period when Tulunan was ruled by Datu Enok the inhabitants enjoyed the abundance of life through their bountiful harvest from their kaingin. Because of the generosity of nature, the pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Convergent Boundary
A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more Plate tectonics, lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction. The subduction zone can be defined by a plane where many earthquakes occur, called the Wadati–Benioff zone. These collisions happen on scales of millions to tens of millions of years and can lead to volcanism, earthquakes, Orogeny, orogenesis, destruction of lithosphere, and Deformation (geology), deformation. Convergent boundaries occur between oceanic-oceanic lithosphere, oceanic-continental lithosphere, and continental-continental lithosphere. The geologic features related to convergent boundaries vary depending on crust types. Plate tectonics is driven by convection cells in the mantle. Convection cells are the result of heat generated by the radioactive decay of elements in the mantle escaping to the surface and the return of cool materials from the surfac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kidapawan
Kidapawan, officially the City of Kidapawan ( ceb, Dakbayan sa Kidapawan; hil, Dakbanwa sang Kidapawan; Maguindanaon: ''Kuta nu Kidapawan'', Jawi: كوتا نو كيدڤاوان; Obo Monuvu: ''Ingod to Kidapawan''), is a 3rd class component city and capital of the province of Cotabato, Philippines. According to the 2020 Census, it has a population of 160,791 people. It is located at the foot of Mount Apo, it is a popular destination from late October to December and in the summer, when thousands of tourists climb the country's highest mountain. Etymology Many proposed etymologies have been recorded to explain the origin of Kidapawan's name over the decades. In 2017, Karlo Antonio Galay David gathered all written and oral explanations from archival sources and tribal key informants. Galay David gathered thirteen proposed etymologies, and of these thirteen, six are about springs, three are about weddings, three are about highlands, two are names, and three are directional an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M'lang, Cotabato
M'lang, officially the Municipality of M'lang ( Hiligaynon: ''Banwa sang M'lang;'' Maguindanaon: ''Inged nu Melang'', Jawi: ايڠايد نو ملڠ), is a 1st class municipality in the province of Cotabato, Philippines. According to the 2020 census, it has a population of 98,195 people. Etymology The name M'lang was derived from a Maguindanaon word ''Tamlang/Tamelang'' which means "bamboo". History In 1930s, migrants mostly from the islands of Panay and Negros in Western Visayas and some parts of Luzon settled in M'lang. Jacinto Paclibar, who was in search for more fertile lands and vast settlement was the first Christian who settled in M'lang. In the Second World War, he was appointed Chairman of the Civil Emergency Administration under the 118th Infantry Regiment of Wendell Fertig's 10th Military Division, assuming his position in M'lang. After the war ended, he was appointed as Deputy Governor of the undivided Cotabato until 1949. He had in mind a government assiste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbio
Columbio, is a 1st class municipality in Sultan Kudarat, Philippines. According to the 2020 census, it has a population of 33,527 people. History The municipality of Columbio was transferred from Cotabato Province to Province of Sultan Kudarat on November 22, 1973, by presidential decree 341 by President Ferdinand E. Marcos. Geography Barangays Columbio is politically subdivided into 16 barangay A barangay (; abbreviated as Brgy. or Bgy.), historically referred to as barrio (abbreviated as Bo.), is the smallest administrative division in the Philippines and is the native Filipino term for a village, district, or ward. In metropolita ...s. Climate Demographics Columbio is inhabited by ethnic groups such as the Ilocanos, Ilonggos, Blaan and Maguindanaon. Ilocanos and Ilonggos are the only inhabitants of the town not native to Mindanao. Economy References External links Columbio Profile at PhilAtlas.com Columbio Profile at the DTI Cities and Municipaliti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epicenter
The epicenter, epicentre () or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates. Surface damage Before the instrumental period of earthquake observation, the epicenter was thought to be the location where the greatest damage occurred, but the subsurface fault rupture may be long and spread surface damage across the entire rupture zone. As an example, in the magnitude 7.9 Denali earthquake of 2002 in Alaska, the epicenter was at the western end of the rupture, but the greatest damage was about away at the eastern end. Focal depths of earthquakes occurring in continental crust mostly range from . Continental earthquakes below are rare whereas in subduction zone earthquakes can originate at depths deeper than . Epicentral distance During an earthquake, seismic waves propagate in all directions from the hypocenter. Seismic shadowing occurs on the opposite s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Wave Magnitude
The surface wave magnitude (M_s) scale is one of the magnitude scales used in seismology to describe the size of an earthquake. It is based on measurements of Rayleigh surface waves that travel along the uppermost layers of the Earth. This magnitude scale is related to the local magnitude scale proposed by Charles Francis Richter in 1935, with modifications from both Richter and Beno Gutenberg throughout the 1940s and 1950s. It is currently used in People's Republic of China as a national standard (GB 17740-1999) for categorising earthquakes. Recorded magnitudes of earthquakes through the mid 20th century, commonly attributed to Richter, could be either M_s or M_L. Definition The formula to calculate surface wave magnitude is: :M_s = \log_\left(\frac\right)_ + \sigma(\Delta)\,, where A is the maximum particle displacement in surface waves (vector sum of the two horizontal displacements) in μm, T is the corresponding period in s (usually 20 2 seconds), Δ is the epi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2019 Cotabato EQs+faults
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United States Geological Survey
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philippine Fault System
The Philippine Fault System is a major inter-related system of geological faults throughout the whole of the Philippine Archipelago, primarily caused by tectonic forces compressing the Philippines into what geophysicists call the Philippine Mobile Belt. Some notable Philippine faults include the Guinayangan, Masbate and Leyte faults. Philippine Mobile Belt The Philippine Mobile Belt is composed of a large number of accretionary blocks and terranes. These terranes are long and narrow like the Zambales ophiolites which is at least 400 km long and 50 km wide. The strips generally run north–south and the zones of convergence are usually demarcated by fault lines. The Philippine Mobile Belt is compressed on the west by the Eurasian Plate and two arms of the Sunda Plate, and on the east by the Philippine Sea Plate. These tectonic plates have compressed and lifted parts of the Philippines causing extensive faulting, primarily on a north–south axis. All faults in the P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strike-slip
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geologic maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cotabato Trench
The Cotabato Trench is an oceanic trench in the Pacific Ocean, off the southwestern coast of Mindanao in the Philippines. Along this trench the oceanic crust of the Sunda Plate beneath the Celebes Sea is being subducted beneath the Philippines Mobile Belt. It forms part of a linked set of trenches along the western side of the Philippines formed over east-dipping subduction zones, including the Manila Trench and the Negros Trench. At its northern end the rate of convergence across this boundary is about 100 mm per year. It is a relatively young structure, forming during the late Miocene to Pliocene. This age is consistent with the estimated age of the sedimentary rocks in the accretionary wedge associated with the trench and the age of adakitic arc rocks on Mindanao thought to date the onset of subduction. Seismicity The trench is associated with large megathrust earthquakes, including the 1918 Celebes Sea earthquake (M 8.3), the 1976 Moro Gulf earthquake (M 8.0) and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
