From south to north and from north to south, people of all ethnic groups eagerly look forward to the first snow in 2018 . Snow does not come and the earthquake is coming. Of course, the scope of observation is different and do not misunderstand. Globally , the first major earthquake in 2018 took place in the Gulf of Alaska, with magnitude 8.2 ( USGS data) and China Earthquake Network Center 8.0 . Regardless of whether it is 8.0 or 8.2 , it belongs to a very large earthquake from the earthquake classification. China Seismological Network officially determined: Time: at 17:31 on January 23 Location: Alaska Bay Positioning: 56.0 degrees north latitude , 149.1 degrees west longitude Magnitude: 8.0 Depth: 10 km Main Distribution of Mainshock and Aftershock in the 8.2 -magnitude Alaskan Bay Earthquake This earthquake, When it happens because there are not many earthquakes at this level of the global scale every year, (Data source: "Q&A for earthquake prevention and disaster reduction") In terms of magnitude and explosive energy It's like the spire of a pyramid Overlooking the earthquake If you say something wrong, If the earth does not meet the earthquake for many years, Um, the first major earthquake in 2018 , some of them said something. Watching Therefore, avoiding earthquake zones is the easiest option, as long as you do not often live on the edge of these plates, do not worry. Of course, I know you like to travel, sunshine, beaches, islands, holidays. . . There are indeed many such famous scenic spots, such as Bali, Saipan, etc., that is, the edge of the board. Fortunately, the major earthquakes are not as frequent as winds and rains, otherwise nobody can eat too much. The 8.2 -magnitude quake on the Gulf of Alaska occurred in a famous place. . . . Not a scenic spot, it is an earthquake area. Alaska had a history of three large-scale earthquake, respectively, in 1957 9.1, 1964 9.2 and 1965 8.7. Both before and after caused a large tsunami. The 1964 earthquake caused more than 100 deaths. This place is located at the intersection of the Pacific Plate and the North American Plate. The plates are squeezed to generate energy. Once the balance of force is exceeded, an earthquake occurs. Watching The Gulf of Alaska earthquake triggered the Pacific Tsunami warning directly from the magnitude. Not surprisingly, the triggering threshold for the Pacific Tsunami Warning is not high, triggering at level 6 or above. However, if you can really make a big move, how can you get more than 7.5 ? There are three conditions for the formation of an earthquake and tsunami: one is that the earthquake is deep in the sea, and the second is a coastal condition where the magnitude is large enough, and the third is open and gradually shallow. The production of a tsunami is a more complicated issue. Only about 20% of the earthquakes on the seabed can cause tsunami. How much impact does the Pacific Tsunami produced by the Pacific Earthquake have on China? The answer is: not much impact. From the topographical point of view, a series of island arcs in the east of Asia, from the north to the south of the Kamchatka Peninsula, the Chiba Islands, the Japanese Islands, and the Philippine Islands, shield most of China’s coastline. In addition, most of China’s sea areas are shallow water continental shelf zones with a gentle sea floor and a minimal slope. If there is an invading Pacific Ocean tsunami, this is a natural buffer zone. Therefore, it is very unlikely that China will be hit by the tsunami from the Pacific Ocean. For example, the tsunami triggered by the 9.5 magnitude earthquake in Chile in 1960 swept across the Pacific, but it only caused a wave of more than a dozen centimeters to reach Shanghai, and drowned on the waves. A major earthquake that can be taken seriously or improperly, The information in this article comes from eyewitness disasters.
Roller bearing, one of the two members of the class of rolling, or so-called antifriction, bearings (the other member of the class is the Ball Bearing). Like a ball bearing, a roller bearing has two grooved tracks, or races, but the balls are replaced by rollers. The rollers may be cylinders or truncated cones. Only radial loads (i.e., loads perpendicular to the axis of rotation) can be carried when the rollers are cylindrical, but with conical rollers both radial and thrust, or axial, loads (i.e., ones parallel to the axis of rotation) can be carried. A needle bearing has cylindrical rollers that are relatively slender and completely fill the space between the races; in many cases the inner race is dispensed with. Because there is line contact between a roller and the races, while in a ball bearing there is point contact, in a given space a roller bearing can carry a greater radial load than a ball bearing.
Roller bearings are used in all main shaft and auxiliary drive shaft applications to support pure radial load, and allow for axial shaft elongation due to temperature changes with no additional load effect on the bearing. They are usually located at the ends of the turbine and compressor shafts and are often mounted in a housing, but separated from it by a layer of pressurized oil known as a squeeze film damper. Roller Bearing,Self-Aligning Roller Bearing,Double Row Roller Bearing,Neddle Roller Bearing Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearing.com
In many cases, instead of having a separate inner race for roller bearings, the [inner race" is an integral part of the shaft or stub shaft. This reduces complexity, weight, and build-up of concentricity tolerances. Overall, this is cost effective, but the cost of replacement or repair is likely to be higher than for separate inner races.
The First Great Earthquake in 2018: Earthquake of magnitude 8.0 in the Gulf of Alaska
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