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Fusakichi Omori
was a pioneer Japanese seismologist, second chairman of seismology at the Imperial University of Tokyo and president of the Japanese Imperial Earthquake Investigation Committee. Omori is also known for his observation describing the aftershock rate of earthquakes, now known as Omori's law. Education Omori studied physics with the initial British foreign advisors serving as professors at the Imperial University of Tokyo, especially John Milne until he left Japan in 1895, as well as Japanese colleagues including Seikei Sekiya who in 1880 became the first professor of seismology at Tokyo Imperial University. Early career Sekiya and Omori published the first clear record of a destructive earthquake, obtained by their measuring devices at the university. In 1886 Sekiya was made chair of seismology and secretary to the Imperial Earthquake Investigation Committee and by the time of his death a decade later, Japan had nearly 1000 seismological recording stations to study seismicity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fukui, Fukui
is the capital city of Fukui Prefecture, Japan. , the city had an estimated population of 264,217, and a population density of 69.2 persons per km2, in 102,935 households. Its total area is . Most of the population lives in a small central area; the city limits include rural plains, mountainous areas, and suburban sprawl along the Route 8 bypass. Overview Cityscape File:Fukui Station Hokuriku 2018.09.28.jpg, Fukui Station（2018） File:Fukui Castle Ruins-daimyomachi station.jpg, Downtown of FukuiCity（2018） File:Fukui city aerial 03.jpg, FukuiCity Aerial（2014） File:Tsukumo bridge.jpg, Skyline of FukuiCity（2013） Geography Fukui is located in the coastal plain in north-central part of the prefecture. It is bordered by the Sea of Japan to the west and the Ryōhaku Mountains to the east. The Kuzuryū River flows through the city. Climate Fukui has a humid subtropical climate (Köppen climate classification ''Cfa'') with hot, humid summers and cool winters. Precipita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1891 Mino–Owari Earthquake
The struck the Japanese provinces of Mino and Owari (present-day Gifu Prefecture) in the Nōbi Plain in the early morning of October 28 with a surface wave magnitude of 8.0 and moment magnitude of 7.5. The event, also referred to as the , the , or the , is the largest known inland earthquake to have occurred in the Japanese archipelago. The earthquake came at a time when Japan was undergoing a transformation into a more industrial nation and while advancing its scientific understanding in many fields. Damage from the event was widespread and the loss of life was significant. The many kilometers of visible fault breaks on the surface of the earth presented scientists with opportunities for field investigations that ultimately led to an improved understanding of the fault scarps that earthquakes often generate. Preface Records of historical earthquakes and tsunami extend further back in time in Japan than any other country that lies along the Pacific Rim (the first documente ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of California, Berkeley
The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public land-grant research university in Berkeley, California. Established in 1868 as the University of California, it is the state's first land-grant university and the founding campus of the University of California system. Its fourteen colleges and schools offer over 350 degree programs and enroll some 31,800 undergraduate and 13,200 graduate students. Berkeley ranks among the world's top universities. A founding member of the Association of American Universities, Berkeley hosts many leading research institutes dedicated to science, engineering, and mathematics. The university founded and maintains close relationships with three national laboratories at Berkeley, Livermore and Los Alamos, and has played a prominent role in many scientific advances, from the Manhattan Project and the discovery of 16 chemical elements to breakthroughs in computer science and genomics. Berkeley is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Francisco, California
San Francisco (; Spanish for " Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of , at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include ''SF'', ''San Fran'', ''The '', ''Frisco'', and ''Baghdad by the Bay''. San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern California
Northern California (colloquially known as NorCal) is a geographic and cultural region that generally comprises the northern portion of the U.S. state of California. Spanning the state's northernmost 48 counties, its main population centers include the San Francisco Bay Area (anchored by the cities of San Jose, San Francisco, and Oakland), the Greater Sacramento area (anchored by the state capital Sacramento), the Redding, California, area south of the Cascade Range, and the Metropolitan Fresno area (anchored by the city of Fresno). Northern California also contains redwood forests, along with most of the Sierra Nevada, including Yosemite Valley and part of Lake Tahoe, Mount Shasta (the second-highest peak in the Cascade Range after Mount Rainier in Washington), and most of the Central Valley, one of the world's most productive agricultural regions. The 48-county definition is not used for the Northern California Megaregion, one of the 11 megaregions of the United States. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1906 San Francisco Earthquake
At 05:12 Pacific Standard Time on Wednesday, April 18, 1906, the coast of Northern California was struck by a major earthquake with an estimated moment magnitude of 7.9 and a maximum Mercalli intensity of XI (''Extreme''). High-intensity shaking was felt from Eureka on the North Coast to the Salinas Valley, an agricultural region to the south of the San Francisco Bay Area. Devastating fires soon broke out in San Francisco and lasted for several days. More than 3,000 people died, and over 80% of the city was destroyed. The events are remembered as one of the worst and deadliest earthquakes in the history of the United States. The death toll remains the greatest loss of life from a natural disaster in California's history and high on the lists of American disasters. Tectonic setting The San Andreas Fault is a continental transform fault that forms part of the tectonic boundary between the Pacific Plate and the North American Plate. The strike-slip fault is characterized by ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1908 Messina Earthquake
The 1908 Messina earthquake (also known as the 1908 Messina and Reggio earthquake) occurred on 28 December in Sicily and Calabria, southern Italy with a moment magnitude of 7.1 and a maximum Mercalli intensity of XI (''Extreme''). The epicenter was in the Strait of Messina which separates Sicily from the Italian mainland. The cities of Messina and Reggio Calabria were almost completely destroyed and between 75,000 and 82,000 people died. It was the most destructive earthquake ever to strike Europe. Cause of the earthquake According to Italy's National Institute of Geophysics and Vulcanology, the earthquake was caused by a large, low-angle SE-dipping, blind normal fault, lying mainly offshore in the Strait of Messina, between plates. Its upper projection intersects the Earth's surface on the western, Sicilian side of the Strait. In 2019 researchers at Birkbeck, University of London discovered the active fault responsible for the earthquake. The study, led by Dr. Marco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake Shaking Table
There are several different experimental techniques that can be used to test the response of structures and soil or rock slopes to verify their seismic performance, one of which is the use of an earthquake shaking table (a shaking table, or simply shake table). This is a device for shaking scaled slopes, structural models or building components with a wide range of simulated ground motions, including reproductions of recorded earthquakes time-histories. While modern tables typically consist of a rectangular platform that is driven in up to six degrees of freedom (DOF) by servo-hydraulic or other types of actuators, the earliest shake table, invented at the University of Tokyo in 1893 to categorize types of building construction, ran on a simple wheel mechanism. Test specimens are fixed to the platform and shaken, often to the point of failure. Using video records and data from transducers, it is possible to interpret the dynamic behaviour of the specimen Specimen may refer to: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake Engineering
Earthquake engineering is an interdisciplinary branch of engineering that designs and analyzes structures, such as buildings and bridges, with earthquakes in mind. Its overall goal is to make such structures more resistant to earthquakes. An earthquake (or seismic) engineer aims to construct structures that will not be damaged in minor shaking and will avoid serious damage or collapse in a major earthquake. Earthquake engineering is the scientific field concerned with protecting society, the natural environment, and the man-made environment from earthquakes by limiting the seismic risk to socio-economically acceptable levels. Traditionally, it has been narrowly defined as the study of the behavior of structures and geo-structures subject to seismic loading; it is considered as a subset of structural engineering, geotechnical engineering, mechanical engineering, chemical engineering, applied physics, etc. However, the tremendous costs experienced in recent earthquakes have led to an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mudbrick
A mudbrick or mud-brick is an air-dried brick, made of a mixture of loam, mud, sand and water mixed with a binding material such as rice husks or straw. Mudbricks are known from 9000 BCE, though since 4000 BCE, bricks have also been fired, to increase their strength and durability. In warm regions with very little timber available to fuel a kiln, bricks were generally sun-dried. In some cases, brickmakers extended the life of mud bricks by putting fired bricks on top or covering them with stucco. Ancient world The history of mudbrick production and construction in the southern Levant may be dated as far back to the Pre-Pottery Neolithic A (e.g., PPNA Jericho). These sun dried mudbricks, also known as adobe or just mudbrick, were made from a mixture of sand, clay, water and frequently temper (e.g. chopped straw and chaff branches), and were the most common method/material for constructing earthen buildings throughout the ancient Near East for millennia. Unfired ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soil Liquefaction
Soil liquefaction occurs when a cohesionless saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress such as shaking during an earthquake or other sudden change in stress condition, in which material that is ordinarily a solid behaves like a liquid. In soil mechanics, the term "liquefied" was first used by Allen Hazen in reference to the 1918 failure of the Calaveras Dam in California. He described the mechanism of flow liquefaction of the embankment dam as: The phenomenon is most often observed in saturated, loose (low density or uncompacted), sandy soils. This is because a loose sand has a tendency to compress when a load is applied. Dense sands, by contrast, tend to expand in volume or 'dilate'. If the soil is saturated by water, a condition that often exists when the soil is below the water table or sea level, then water fills the gaps between soil grains ('pore spaces'). In response to soil compressing, the po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1906 Meishan Earthquake
The 1906 Meishan earthquake () was centered on ''Moe'akhe'' (), Kagi-cho, Japanese Taiwan (modern-day Meishan, Chiayi County, Taiwan) and occurred on March 17. Referred to at the time as the Great Kagi earthquake (), it is the third-deadliest earthquake in Taiwan's recorded history, claiming around 1,260 lives. The shock had a surface wave magnitude of 6.8 and a Mercalli intensity of IX (''Violent''). Earthquake The earthquake struck at 06:43 local time on 17 March 1906, at a focal depth of 6 kilometres (3.7 mi). The event created the Meishan fault, a fault with a length of 25 kilometres (15.5 mi) stretching through modern-day Chiayi County. Aftershocks continued throughout the day, hampering rescue efforts. Damage Reports vary slightly, but according to the official Central Weather Bureau summary, the casualties and damage were as follows: *Deaths: 1,258 *Injuries: 2,385 *Houses destroyed: 6,769 *Houses damaged: 14,218 Fusakichi Omori, a pioneering seismologist fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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