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2014 Orkney Earthquake
The 2014 Orkney earthquake occurred at 12:22:33 SAST on 5 August, with the epicentre near Orkney, a gold mining town in the Klerksdorp district in the North West province of South Africa. The shock was assigned a magnitude of 5.5 on the Richter scale by the Council for Geoscience (CGS) in South Africa, making it the biggest earthquake in South Africa since the 1969 Tulbagh earthquake, which had a magnitude of 6.3 on the Richter scale. The United States Geological Survey (USGS) estimated a focal depth of . The CGS reported 84 aftershocks on 5 August and 31 aftershocks on 6 August, with a magnitude of 1.0 to 3.8 on the Richter scale. According to the CGS, the earthquake is the biggest mining-related earthquake in South African history. Cause Historical seismicity While earthquakes are uncommon in South Africa in general, the earthquake occurred in a mining belt where earthquakes are relatively common. The CGS had described a 2005 earthquake with a magnitude of 5.3 o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Time In South Africa
South African Standard Time (SAST) is the time zone used by all of South Africa as well as Eswatini and Lesotho. The zone is two hours ahead of UTC ( UTC+02:00) and is the same as Central Africa Time. Daylight saving time is not observed in either time zone. Solar noon in this time zone occurs at 30° E in SAST, effectively making Pietermaritzburg at the correct solar noon point, with Johannesburg and Pretoria slightly west at 28° E and Durban slightly east at 31° E. Thus, most of South Africa's population experience true solar noon at approximately 12:00 daily. The western Northern Cape and Western Cape differ, however. Everywhere on land west of 22°30′ E effectively experiences year-round daylight saving time because of its location in true UTC+01:00 but still being in South African Standard Time. Sunrise and sunset are thus relatively late in Cape Town, compared to the rest of the country. To illustrate, daylight hours for South Africa's western a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1969 Tulbagh Earthquake
The 1969 Tulbagh earthquake occurred at 20:03:33 UTC on 29 September. It had a magnitude of 6.3 and a maximum felt intensity of VIII (''Severe'') on the Modified Mercalli intensity scale. It caused widespread damage in the towns of Ceres, Tulbagh and Wolseley and led to 12 deaths. The earthquake was a result of strike-slip faulting along a NW-SE trending near vertical fault plane, as shown by the focal mechanism and the distribution of aftershocks. Tectonic setting The Western Cape lies on the Cape Fold Belt, which is characterised by many thrust faults. Some of these thrust faults were reactivated during Cretaceous rifting as extensional faults, such as the Worcester Fault, which comes to the surface close to the epicentral area, but does not appear to be active. Earthquake The earthquake was estimated to have a magnitude of 6.3 . The ISC-GEM catalogue records it as 6.3 . The focal mechanism shows that the earthquake was a result of strike-slip faulting, either sinistral mov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Station Orkney NW
Station may refer to: Agriculture * Station (Australian agriculture), a large Australian landholding used for livestock production * Station (New Zealand agriculture) A station or run, in the context of New Zealand agriculture, is a large farm dedicated to the grazing of sheep and cattle. The use of the word for the farm or farm buildings date back to the mid-nineteenth century. The owner of a station is call ..., a large New Zealand farm used for grazing by sheep and cattle ** Cattle station, a cattle-rearing station in Australia or New Zealand **Sheep station, a sheep-rearing station in Australia or New Zealand Communications * Radio communication station, a radio frequency communication station of any kind, including audio, TV, and non-broadcast uses ** Radio broadcasting station, an audio station intended for reception by the general public ** Amateur radio station, a station operating on frequencies allocated for ham or other non-commercial use ** Broadcast relay station ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pretoria
Pretoria () is South Africa's administrative capital, serving as the seat of the Executive (government), executive branch of government, and as the host to all foreign embassies to South Africa. Pretoria straddles the Apies River and extends eastward into the foothills of the Magaliesberg mountains. It has a reputation as an academic city and center of research, being home to the Tshwane University of Technology (TUT), the University of Pretoria (UP), the University of South Africa (UNISA), the Council for Scientific and Industrial Research (CSIR), and the Human Sciences Research Council. It also hosts the National Research Foundation (South Africa), National Research Foundation and the South African Bureau of Standards. Pretoria was one of the host cities of the 2010 FIFA World Cup. Pretoria is the central part of the City of Tshwane Metropolitan Municipality which was formed by the amalgamation of several former local authorities, including Bronkhorstspruit, Centurion, Gaute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
East African Rift
The East African Rift (EAR) or East African Rift System (EARS) is an active continental rift zone in East Africa. The EAR began developing around the onset of the Miocene, 22–25 million years ago. In the past it was considered to be part of a larger Great Rift Valley that extended north to Asia Minor. A narrow zone, the rift is a developing divergent tectonic plate boundary where the African Plate is in the process of splitting into two tectonic plates, called the Somali Plate and the Nubian Plate, at a rate of 6-7 mm per year. The rift system consists of three microplates, the Victoria Microplate to the north, and the Rovuma and Lwandle microplates to the south. The Victoria Microplate is rotating anti-clockwise with respect to the African plate. Its rotation is caused by the configuration of mechanically weaker and stronger lithospheric regions in the EARS. Extent A series of distinct rift basins, the East African Rift System extends over thousands of kilometers. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Welkom
Welkom () is the second-largest city in the Free State province of South Africa, located about northeast of Bloemfontein which is the provincial capital. Welkom is also known as Circle City, City Within A Garden, Mvela and Matjhabeng. The city's Sesotho name, ''Matjhabeng'' means 'where nations meet', derived from the migrant labour system, where people of various countries such as Lesotho, Malawi and Mozambique etc. met to work in the mines of the gold fields. A settlement was laid out on a farm named "Welkom" (which is the Afrikaans and Dutch word for "welcome") after gold was discovered in the region, and it was officially proclaimed a town in 1948. The town became a municipality in 1961. It now falls in the Matjhabeng Municipality, part of the Lejweleputswa District. Welkom was officially declared a city on 14 February 1968. History Much of the history of Welkom is centred around the discovery of gold in the northwestern Free State. It was proclaimed a town in 1948, ni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Pretoria
The University of Pretoria ( af, Universiteit van Pretoria, nso, Yunibesithi ya Pretoria) is a multi-campus public university, public research university in Pretoria, the administrative and de facto capital of South Africa. The university was established in 1908 as the Pretoria campus of the Johannesburg-based Transvaal University College and is the fourth South African institution in continuous operation to be awarded university status. The university has grown from the original 32 students in a single late Victorian house to approximately 53,000 in 2019. The university was built on seven suburban campuses on . The university is organised into nine faculties and a business school. Established in 1920, the University of Pretoria Faculty of Veterinary Science is the second oldest veterinary school in Africa and the only veterinary school in South Africa. In 1949, the university launched the first MBA programme outside North America, and the university's Gordon Institute of Busin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Council For Scientific And Industrial Research
The Council for Scientific and Industrial Research (CSIR) is South Africa's central and premier scientific research and development organisation. It was established by an act of parliament in 1945 and is situated on its own campus in the city of Pretoria. It is the largest research and development (R&D) organisation in Africa and accounts for about 10% of the entire African R&D budget. It has a staff of approximately 3,000 technical and scientific researchers, often working in multi-disciplinary teams. CSIR contract research and development Overview The CSIR contract R&D portfolio aims to enable clear understanding of national imperatives and the needs of industry to optimise the impact of the CSIR's R&D outputs. It leverages public, private and international partnerships in support of cutting-edge science, engineering and technology (SET).The organisation has clients in both the private sector (micro, small, medium and large enterprises; formal and informal), as well as in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foreshock
A foreshock is an earthquake that occurs before a larger seismic event (the mainshock) and is related to it in both time and space. The designation of an earthquake as ''foreshock'', ''mainshock'' or aftershock is only possible after the full sequence of events has happened. Occurrence Foreshock activity has been detected for about 40% of all moderate to large earthquakes, and about 70% for events of M>7.0. They occur from a matter of minutes to days or even longer before the main shock; for example, the 2002 Sumatra earthquake is regarded as a foreshock of the 2004 Indian Ocean earthquake with a delay of more than two years between the two events. Some great earthquakes (M>8.0) show no foreshock activity at all, such as the M8.6 1950 India–China earthquake. The increase in foreshock activity is difficult to quantify for individual earthquakes but becomes apparent when combining the results of many different events. From such combined observations, the increase before the mai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth Science
Earth science or geoscience includes all fields of natural science related to the planet Earth. This is a branch of science dealing with the physical, chemical, and biological complex constitutions and synergistic linkages of Earth's four spheres, namely biosphere, hydrosphere, atmosphere, and geosphere. Earth science can be considered to be a branch of planetary science, but with a much older history. Earth science encompasses four main branches of study, the lithosphere, the hydrosphere, the atmosphere, and the biosphere, each of which is further broken down into more specialized fields. There are both reductionist and holistic approaches to Earth sciences. It is also the study of Earth and its neighbors in space. Some Earth scientists use their knowledge of the planet to locate and develop energy and mineral resources. Others study the impact of human activity on Earth's environment, and design methods to protect the planet. Some use their knowledge about Earth processes suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DRDGOLD Limited
DRDGOLD Limited (formerly Durban Roodepoort Deep Limited) is a South African gold producer and a specialist in the recovery of the metal from the retreatment of surface tailings. The company is listed on the New York and Johannesburg Johannesburg ( , , ; Zulu and xh, eGoli ), colloquially known as Jozi, Joburg, or "The City of Gold", is the largest city in South Africa, classified as a megacity, and is one of the 100 largest urban areas in the world. According to Demo ... Johannesburg Stock exchange stock exchanges. Their financial year ends on 30 June. References Companies listed on the New York Stock Exchang ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismicity Map South Africa
Seismicity is a measure encompassing earthquake occurrences, mechanisms, and magnitude at a given geographical location. As such, it summarizes a region's seismic activity. The term was coined by Beno Gutenberg and Charles Francis Richter in 1941. Seismicity is studied by geophysicists. Calculation of seismicity Seismicity is quantitatively computed. Generally, the region under study is divided in equally sized areas defined by latitude and longitude, and the Earth's interior is divided into various depth intervals on account of Earth's layering: Up to depth, , and > . The usual formula to calculate seismicity is: S = \frac where : _i: is the energy of a single seismic event (i.e., earthquake); : _0: interval of latitude; : _0: interval of longitude : _0: interval of the hypocenter; : _0: interval of the time of the seismic event. : The result is seismicity as energy per cubic unit. See also * Moment magnitude scale * Plate tectonics * Seismology * Wadati–Benioff zon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
