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1605 Keichō Earthquake
The 1605 Keichō earthquake () occurred at about 20:00 local time on 3 February. It had an estimated magnitude of 7.9 on the surface wave magnitude scale and triggered a devastating tsunami that resulted in thousands of deaths in the Nankai and Tōkai regions of Japan. It is uncertain whether there were two separate earthquakes separated by a short time interval or a single event. It is referred to as a tsunami earthquake, in that the size of the tsunami greatly exceeds that expected from the magnitude of the earthquake. Background The southern coast of Honshu runs parallel to the Nankai Trough, which marks the subduction of the Philippine Sea Plate beneath the Eurasian Plate. Movement on this convergent plate boundary leads to many earthquakes, some of them of megathrust type. The Nankai megathrust has five distinct segments (A-E) that can rupture independently, the segments have ruptured either singly or together repeatedly over the last 1,300 years. Megathrust earthquakes on ... [...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] |
Convergent Plate Boundary
A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more 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, orogenesis, destruction of lithosphere, and 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 surface to the mantle. These convection cells bring ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atsumi Peninsula
is a peninsula in southern Aichi Prefecture, central Honshū, Japan. It has an approximate length of east-west, separating Mikawa Bay (to the north) from the Philippine Sea to the south, with Ise Bay lying to its west. It faces the Chita Peninsula, to the northwest, across the entrance to Mikawa Bay. It has a width ranging from to , and its highest point is . Its total area is approximately 200 square kilometers. Atsumi Peninsula is noted for its temperate climate, due to the warm Kuroshio Current offshore. The rock formations at Cape Irago, its western tip, and its beaches are part of the Mikawa Wan Quasi-National Park. Administratively, almost all of the peninsula falls within the city of Tahara, with its eastern "neck" within the city of Toyohashi is a city in Aichi Prefecture, Japan. , the city had an estimated population of 377,453 in 160,516 households and a population density of 1,400 persons per km2. The total area of the city was . By area, Toyohashi was Aich ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tahara, Aichi
is a city in Aichi Prefecture, Japan. , the city had an estimated population of 60,206 in 22,576 households, and a population density of 315 persons per km2. The total area of the city is . Geography Tahara is situated in southern Aichi Prefecture, and occupies most of the hilly Atsumi Peninsula. The peninsula is bounded on the north by Mikawa Bay and to the south lies the Philippine Sea. Situated as it is between those two bodies of water, Tahara has a warm maritime climate. Climate The city has a climate characterized by hot and humid summers, and relatively mild winters (Köppen climate classification ''Cfa''). The average annual temperature in Tahara is . The average annual rainfall is with September as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . Demographics Per Japanese census data, the population of Tahara has been relatively steady over the past 60 years. Neighboring municipalities ;Aichi Prefect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japanese Castle
are fortresses constructed primarily of wood and stone. They evolved from the wooden stockades of earlier centuries, and came into their best-known form in the 16th century. Castles in Japan were built to guard important or strategic sites, such as ports, river crossings, or crossroads, and almost always incorporated the landscape into their defenses. Though they were built to last and used more stone in their construction than most Japanese buildings, castles were still constructed primarily of wood, and many were destroyed over the years. This was especially true during the Sengoku period (1467–1603), when many of these castles were first built. However, many were rebuilt, either later in the Sengoku period, in the Edo period (1603–1867) that followed, or more recently, as national heritage sites or museums. Today there are more than one hundred castles extant, or partially extant, in Japan; it is estimated that once there were five thousand. Some castles, such as the ones a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shizuoka Prefecture
is a prefecture of Japan located in the Chūbu region of Honshu. Shizuoka Prefecture has a population of 3,637,998 and has a geographic area of . Shizuoka Prefecture borders Kanagawa Prefecture to the east, Yamanashi Prefecture to the northeast, Nagano Prefecture to the north, and Aichi Prefecture to the west. Shizuoka is the capital and Hamamatsu is the largest city in Shizuoka Prefecture, with other major cities including Fuji, Numazu, and Iwata. Shizuoka Prefecture is located on Japan's Pacific Ocean coast and features Suruga Bay formed by the Izu Peninsula, and Lake Hamana which is considered to be one of Japan's largest lakes. Mount Fuji, the tallest volcano in Japan and cultural icon of the country, is partially located in Shizuoka Prefecture on the border with Yamanashi Prefecture. Shizuoka Prefecture has a significant motoring heritage as the founding location of Honda, Suzuki, and Yamaha, and is home to the Fuji International Speedway. History Shizuoka Prefe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arai, Shizuoka
was a town located in Hamana District, Shizuoka Prefecture, Japan. As of March 31, 2010, the town had an estimated population of 16,975 and a population density of 910 persons per km2. The total area was 18.65 km2. On March 23, 2010, Arai was merged into the expanded city of Kosai and thus no longer exists as an independent municipality. Hamana District was dissolved as a result of this merger. Geography Arai was located at the southwest end of Shizuoka Prefecture, with part of Lake Hamana located within the town boundaries. The town was on the Enshu Sea of the Pacific Ocean, with a temperate maritime climate with hot, humid summers and mild, cool winters. History Arai was located in former Tōtōmi Province, and was largely ''tenryō'' territory under direct control of the Tokugawa shogunate in the Edo period, when it was called Arai-juku, and prospered as a post town on the Tōkaidō highway connecting Edo with Kyoto. During the cadastral reform of the early Meiji ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wakayama Prefecture
is a prefecture of Japan located in the Kansai region of Honshu. Wakayama Prefecture has a population of 944,320 () and has a geographic area of . Wakayama Prefecture borders Osaka Prefecture to the north, and Mie Prefecture and Nara Prefecture to the northeast. Wakayama is the capital and largest city of Wakayama Prefecture, with other major cities including Tanabe, Hashimoto, and Kinokawa. Wakayama Prefecture is located on the western coast of the Kii Peninsula on the Kii Channel, connecting the Pacific Ocean and Seto Inland Sea, across from Tokushima Prefecture on the island of Shikoku. History Present-day Wakayama is mostly the western part of the province of Kii. 1953 flood disaster On July 17–18, 1953, a torrential heavy rain occurred, followed by collapse of levees, river flooding and landslides in a wide area. Many bridges and houses were destroyed. According to an officially confirmed report by the Government of Japan, 1,015 people died, with 5,709 injured ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hirogawa, Wakayama
270px, Inamura no hi no yakata is a town in Arida District, Wakayama Prefecture, Japan. , the town had an estimated population of 6,778 in 2833 households and a population density of 100 persons per km². The total area of the town is . Geography Hirogawa is located on the coast in north-central Wakayama Prefecture, facing the Kii Channel. The Hirogawa River flows through the town. The climate is moderated by the influence of the Kuroshio Current offshore. Neighboring municipalities Wakayama Prefecture * Yuasa * Aridagawa * Yura * Hidaka * Hidakagawa Climate Hirogawa has a Humid subtropical climate (Köppen ''Cfa'') characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Hirogawa is 15.7 °C. The average annual rainfall is 1878 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.0 °C, and lowest in January, at around 5.8 °C. The area is subject to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Hamana
is a brackish lagoon in Shizuoka Prefecture, Japan. Formerly a true lake, it is now connected to the Pacific Ocean by a channel. As an internal body of water, it is considered Japan's tenth-largest lake (by area). It spans the boundaries of the cities of Hamamatsu and Kosai. Data The lake has an area of 65.0 km2 and holds 0.35 km3 of water. Its circumference is 114 km. At its deepest point, the water is 16.6 m deep. The surface is at sea level. Economic activity Lake Hamana is a commercial source of cultivated Japanese eel, ''nori'', oysters and Chinese soft-shelled turtles. Fishers take sea bass, whiting, and flounder, among others. The lake has been developed as a resort area, with boating as a feature. History In ancient times, Lake Hamana was a freshwater lake. However, the 1498 Meiō Nankaidō earthquake altered the topography of the area and connected the lake to the ocean. As a result, the water in the lake is now brackish. The old name for this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kii Peninsula
The is the largest peninsula on the island of Honshū in Japan. It is named after the ancient Kii Province. Overview The area south of the “ Central Tectonic Line” is called , and is home to reef-like coral communities which are amongst the northernmost in the world (apart from cold-water corals) due to the presence of the warm Kuroshio Current, though these are threatened by global warming and human interference. Because of the Kuroshio’s strong influence, the climate of Nankii is the wettest in the Earth’s subtropics with rainfall in the southern mountains believed to reach per year and averaging in the southeastern town of Owase, comparable to Ketchikan, Alaska or Tortel in southern Chile. When typhoons hit Japan, the Kii Peninsula is typically the worst affected area and daily rainfalls as high as are known so the Kii Peninsula is often referred to as the Typhoon Ginza (after Ginza in Tokyo). Most of the Kii Peninsula is dense temperate rainforest since the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tsunami Deposit
A tsunami deposit (the term tsunamiite is also sometimes used) is a sedimentary unit deposited as the result of a tsunami. Such deposits may be left onshore during the inundation phase or offshore during the 'backwash' phase. Such deposits are used to identify past tsunami events and thereby better constrain estimates of both earthquake and tsunami hazards. There remain considerable problems, however, in distinguishing between deposits caused by tsunamis and those caused by storms or other sedimentary processes. Tsunamiite The term "tsunamiite" or "tsunamite" was introduced in the 1980s to describe deposits interpreted to have been formed by traction processes associated with tsunamis and is particularly used for marine deposits formed during the "backwash" phase. The term's application has broadened to encompass all tsunami-related deposits, but its use has been challenged. The main criticism of the term is that it describes deposits that have formed by many different processes t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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