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1888 Río De La Plata Earthquake
The 1888 Río de la Plata earthquake occurred on 5 June measuring 5.5 on the Richter magnitude scale, and shook the upper Río de la Plata at 3:20 UTC-3. The epicentre was located southwest of Colonia del Sacramento (Uruguay) and east of Buenos Aires (Argentina), with a hypocentre at a depth of . Newspaper articles On 5 June 1888, the Montevideo journal ''La Tribuna Popular'' reported the earthquake and its effects: ''The houses' woodwork creaked loudly, lamps swung, furniture moved and paintings fell off walls. Glassware objects broke and porcelain could be seen jolting out of cupboards. Astonished at the strong earthquake, inhabitants have had a sleepless night...'' Also, a Colonia del Sacramento local journal ''La Lucha'' reported on a particular event: ''The steamer 'Saturno' en route from the neighbouring country's capital (Buenos Aires) was calmly sailing in of water along the centre of the channel when she came to a sudden halt, as though she had run aground. The c ... [...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] |
Tectonic Plates
Plate tectonics (from the la, label=Late Latin, tectonicus, from the grc, τεκτονικός, lit=pertaining to building) is the generally accepted scientific theory that considers the Earth's lithosphere to comprise a number of large tectonic plates which have been slowly moving since about 3.4 billion years ago. The model builds on the concept of ''continental drift'', an idea developed during the first decades of the 20th century. Plate tectonics came to be generally accepted by geoscientists after seafloor spreading was validated in the mid to late 1960s. Earth's lithosphere, which is the rigid outermost shell of the planet (the crust and upper mantle), is broken into seven or eight major plates (depending on how they are defined) and many minor plates or "platelets". Where the plates meet, their relative motion determines the type of plate boundary: '' convergent'', '' divergent'', or ''transform''. Earthquakes, volcanic activity, mountain-building, and oceanic tren ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
