|
2023 Noto Earthquake
On 5 May 2023, a 6.5 or 6.3 earthquake struck off the coast of Ishikawa Prefecture, Japan. It was located 49 kilometres (30 miles) northeast of Anamizu, Hōsu District, with the town of Suzu closest to the epicenter. Tectonic setting The northeastern tip of the Noto Peninsula has been subject to an earthquake swarm for over two years; the earthquake is one of the largest events in this swarm, surpassing a 5.4 event that took place in June 2022. The earthquake was located in a zone of compressional deformation that is associated with the boundary between the Amur Plate and the Okhotsk Plate. In this area, the Okhotsk Plate is converging to the west-northwest towards the Amur Plate with a velocity of about 9 mm/yr and a maximum convergence rate of 24 mm/yr. The Amur and Okhotsk plates are relatively small plates that are located between the Pacific Plate and the Eurasian Plate. The Pacific Plate converges west-northwest towards the Eurasian Plate at around 90 mm/ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan Standard Time
, or , is the standard time zone in Japan, 9 hours ahead of UTC ( UTC+09:00). Japan does not observe daylight saving time, though its introduction has been debated on several occasions. During World War II, the time zone was often referred to as Tokyo Standard Time. Japan Standard Time is equivalent to Korean Standard Time, Pyongyang Time (North Korea), Eastern Indonesia Standard Time, East-Timorese Standard Time and Yakutsk Time (Russia). History Before the Meiji era (1868–1912), each local region had its own time zone in which noon was when the sun was exactly at its culmination. As modern transportation methods, such as trains, were adopted, this practice became a source of confusion. For example, there is a difference of about 5 degrees longitude between Tokyo and Osaka and because of this, a train that departed from Tokyo would arrive at Osaka 20 minutes behind the time in Tokyo. In 1886, Ordinance 51 was issued in response to this problem, which stated: Acc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Plate
The Pacific Plate is an oceanic tectonic plate that lies beneath the Pacific Ocean. At , it is the largest tectonic plate. The plate first came into existence 190 million years ago, at the triple junction between the Farallon, Phoenix, and Izanagi Plates. The Pacific Plate subsequently grew to where it underlies most of the Pacific Ocean basin. This reduced the Farallon Plate to a few remnants along the west coast of North America and the Phoenix Plate to a small remnant near the Drake Passage, and destroyed the Izanagi Plate by subduction under Asia. The Pacific Plate contains an interior hot spot forming the Hawaiian Islands. Boundaries The north-eastern side is a divergent boundary with the Explorer Plate, the Juan de Fuca Plate and the Gorda Plate forming respectively the Explorer Ridge, the Juan de Fuca Ridge and the Gorda Ridge. In the middle of the eastern side is a transform boundary with the North American Plate along the San Andreas Fault, and a boundary w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niigata Prefecture
is a prefecture in the Chūbu region of Honshu of Japan. Niigata Prefecture has a population of 2,227,496 (1 July 2019) and is the fifth-largest prefecture of Japan by geographic area at . Niigata Prefecture borders Toyama Prefecture and Nagano Prefecture to the southwest, Gunma Prefecture to the south, Fukushima Prefecture to the east, and Yamagata Prefecture to the northeast. Niigata is the capital and largest city of Niigata Prefecture, with other major cities including Nagaoka, Jōetsu, and Sanjō. Niigata Prefecture contains the Niigata Major Metropolitan Area centered on Niigata with a population of 1,395,612, the largest metropolitan area on the Sea of Japan coast and the twelfth-largest in Japan. Niigata Prefecture is part of the historic Hokuriku region and features Sado Island, the sixth largest island of Japan in area following the four main islands and Okinawa Island. History Until after the Meiji Restoration, the area that is now Niigata Prefectu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kanazawa
is the capital city of Ishikawa Prefecture, Japan. , the city had an estimated population of 466,029 in 203,271 households, and a population density of 990 persons per km2. The total area of the city was . Overview Cityscape File:もてなしドーム３.jpg, Kanazawa Station（2013） File:Omichoichibakan004.jpg, Ōmichō-Market（Ōmichō-Ichiba）（2013） File:Kanazawa view from Utatsuyama Park.jpg, Skyline of Kanazawa City（2017） File:Cityscape at downtown Kanazawa.jpg, CBD of Kanazawa File:Katamachi Crossing.jpg, Downtown of Katamachi Area (2022) Geography Kanazawa is located in north-western Ishikawa Prefecture in the Hokuriku region of Japan and is bordered by the Sea of Japan to the west and Toyama Prefecture to the east. The city sits between the Sai and Asano rivers. The eastern portion of the city is dominated by the Japanese Alps. Parts of the city are within the borders of the Hakusan National Park. Climate Kanazawa has a humid subtropical clima ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anamizu, Ishikawa
is a town located in Hōsu District (formerly Fugeshi District), Ishikawa Prefecture, Japan. , the town had an estimated population of 7,782 in 3,653 households, and a population density of 42 persons per km2. The total area of the town was . Geography Anamizu occupies the southeastern coastline of Noto Peninsula, facing the Sea of Japan on the east and south. Anamizu has a humid continental climate (Köppen ''Cfa'') characterized by mild summers and cold winters with heavy snowfall. The average annual temperature in Anamizu is 13.5 °C. The average annual rainfall is 2,352 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.8 °C, and lowest in January, at around 2.9 °C. Parts of the town are within the limits of the Noto Hantō Quasi-National Park. Neighbouring municipalities *Ishikawa Prefecture ** Nanao ** Wajima **Noto **Shika Demographics Per Japanese census data, the population of Anamizu has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanao, Ishikawa
is a Cities of Japan, city located in Ishikawa Prefecture, Japan. , the city had an estimated population of 49,660 people in 21,809 households. The total area of the city was . Nanao is the fifth largest city by population in Ishikawa, behind Kanazawa, Ishikawa, Kanazawa, Hakusan, Ishikawa, Hakusan, Komatsu, Ishikawa, Komatsu, and Kaga, Ishikawa, Kaga. Geography Nanao occupies the southeastern coast of Noto Peninsula and is bordered by the Sea of Japan on the east and north, and Toyama Prefecture to the south. Parts of the city are within the borders of the Noto Hantō Quasi-National Park. The name "Nanao" (七尾) literally means "Seven Tails" and is said to be named for the seven mountain ridges (or "tails") surrounding Nanao that are visible when viewed from Joyama (七尾城山), site of the city's historical castle ruins. These ridges are called ''Kikuo'' (菊尾, ''"Chrysanthemum Tail"''), ''Kameo'' (亀尾, ''"Turtle Tail"''), ''Matsuo'' (松尾, ''"Pine Tail"''), ''Torano ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wajima, Ishikawa
is a city located in Ishikawa Prefecture, Japan. , the city had an estimated population of 27,698 in 12768 households, and a population density of 65 persons per km². The total area of the city was . Geography Wajima occupies the northwestern coast of Noto Peninsula and is bordered by the Sea of Japan on the north and west. Parts of the city are within the borders of the Noto Hantō Quasi-National Park. The island of Hegurajima, located 47 kilometers from the north coast of Noto Peninsula is administratively part of the city of Wajima. Neighbouring municipalities Ishikawa Prefecture: Suzu, Noto, Shika, and Anamizu. Climate Wajima has a humid continental climate (Köppen ''Cfa'') characterized by mild summers and cold winters with heavy snowfall. The average annual temperature in Wajima is . The average annual rainfall is ; September is the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . Demographics P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Noto, Ishikawa
is a town located in Hōsu District (formerly Fugeshi District), Ishikawa Prefecture, Japan. , the town had an estimated population of 17,840 in 7,689 households, and a population density of 65 persons per km2. The total area of the town was . Geography Noto occupies the northeastern coastline of Noto Peninsula, facing the Sea of Japan on the east and south. Noto has a humid continental climate (Köppen ''Cfa'') characterized by mild summers and cold winters with heavy snowfall. The average annual temperature in Noto is 12.8 °C. The average annual rainfall is 2282 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.2 °C, and lowest in January, at around 2.1 °C. Much of the town is within the limits of the Noto Hantō Quasi-National Park. Neighbouring municipalities *Ishikawa Prefecture **Suzu ** Wajima **Anamizu Demographics Per Japanese census data, the population of Noto has declined over the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prefectures Of Japan
Japan is divided into 47 prefectures (, ''todōfuken'', ), which rank immediately below the national government and form the country's first level of jurisdiction and administrative division. They include 43 prefectures proper (, '' ken''), two urban prefectures (, '' fu'': Osaka and Kyoto), one "circuit" or "territory" (, ''dō'': Hokkai-dō) and one metropolis (, '' to'': Tokyo). In 1868, the Meiji ''Fuhanken sanchisei'' administration created the first prefectures (urban ''fu'' and rural ''ken'') to replace the urban and rural administrators ('' bugyō'', '' daikan'', etc.) in the parts of the country previously controlled directly by the shogunate and a few territories of rebels/shogunate loyalists who had not submitted to the new government such as Aizu/ Wakamatsu. In 1871, all remaining feudal domains ''( han)'' were also transformed into prefectures, so that prefectures subdivided the whole country. In several waves of territorial consolidation, today's 47 prefectur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aftershock
In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousands of instrumentally detectable aftershocks, which steadily decrease in magnitude and frequency according to a consistent pattern. In some earthquakes the main rupture happens in two or more steps, resulting in multiple main shocks. These are known as doublet earthquakes, and in general can be distinguished from aftershocks in having similar magnitudes and nearly identical seismic waveforms. Distribution of aftershocks Most aftershocks are located over the full area of fault rupture and either occur along the fault plane itself or along other faults within the volume affected by the strain associated with the main shock. Typically, aftershocks are found up to a distance equal to the rupture length away from the fault plane. The pattern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
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 bl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focal Mechanism
The focal mechanism of an earthquake describes the deformation in the source region that generates the seismic waves. In the case of a fault-related event it refers to the orientation of the fault plane that slipped and the slip vector and is also known as a fault-plane solution. Focal mechanisms are derived from a solution of the moment tensor for the earthquake, which itself is estimated by an analysis of observed seismic waveforms. The focal mechanism can be derived from observing the pattern of "first motions", that is, whether the first arriving P waves break up or down. This method was used before waveforms were recorded and analysed digitally and this method is still used for earthquakes too small for easy moment tensor solution. Focal mechanisms are now mainly derived using semi-automatic analysis of the recorded waveforms. Moment tensor solutions The moment tensor solution is typically displayed graphically using a so-called ''beachball'' diagram. The pattern o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.png "Click for more on -> Japan Standard Time")
