on April 16, 2022
Is a 4.2 earthquake big?
GeologyLight: 4-4.9. GETTY A light earthquake is measured at between 4 and 4.9 on the Richter scale. Like minor quakes, they occur often worldwide, can be felt but generally cause no damage. How strong is a 4.2 earthquake? What is the Richter Magnitude Scale? Richter magnitude Description 4.0-4.9 Light 5.0-5.9 Moderate 6.0-6.9 Strong 7.0-7.9 Major
on April 16, 2022
How is the San Andreas Fault monitored?
GeologyGiven the dense population straddled across the San Andreas Fault System, it is a site of active monitoring through an array of GPS instruments, accelerometers, and seismograms. How do we know where the San Andreas Fault? The San Andreas Fault begins near the Salton Sea, runs north along the San Bernardino Mountains, crosses Cajon Pass,
on April 16, 2022
Are aftershocks bigger than the earthquake?
GeologyAftershocks are smaller earthquakes that occur in the same general area during the days to years following a larger event or “mainshock.” They occur within 1-2 fault lengths away and during the period of time before the background seismicity level has resumed. Are aftershocks stronger than earthquakes? Aftershocks are sometimes just as hazardous as the
on April 16, 2022
What happened in the Alaska Earthquake 1964?
GeologyThe four minute duration of shaking triggered many landslides and avalanches. Major structural damage occurred in many of the major cities in Alaska. The damage totalled 300-400 million dollars (1964 dollars). The number of deaths from the earthquake totalled 131; 115 in Alaska and 16 in Oregon and California. What caused the tsunami in Alaska
on April 16, 2022
What type of fault is Wasatch Fault?
GeologyThe Wasatch fault is called a normal fault, because the slip is mostly vertical – the mountain block (Wasatch Range) moves upward relative to the adjacent downward-moving valley block. The 240-mile-long fault is sectioned into 10 segments averag- ing 25 miles in length. Each segment can rupture independently. What kind of fault is in Utah?
on April 16, 2022
What part of a glacier moves the fastest?
GeologyThe ice in the middle of a glacier flows faster than the ice along the sides of the glacier. What part of the glacier flows the fastest Why? When the lower ice of a glacier flows, it moves the upper ice along with it, so although it might seem from the stress patterns (red numbers
on April 16, 2022
What is the biggest crystal?
GeologyThe largest authenticated crystal of any type is a beryl from Malakialina, Malagasy Republic, being 18 m in length, 3.5 m in diameter, having a volume estimated at 143 m3 and a mass approximately 380,000 kg. Where is the largest crystal in the world? The World’s Largest Crystals Are Growing in a Cave in Mexico
on April 16, 2022
How are seismometers used to detect earthquakes?
GeologySeismometers allow us to detect and measure earthquakes by converting vibrations due to seismic waves into electrical signals, which we can then display as seismograms on a computer screen. Seismologists study earthquakes and can use this data to determine where and how big a particular earthquake is. How do seismometers work? An instrument sensitive to
on April 16, 2022
How many earthquakes are there in a day?
GeologyEarthquakes are always happening somewhere, and the National Earthquake Information Center locates about 12,000-14,000 earthquakes each year. On average, earthquakes of magnitude 2 and smaller occur several hundred times a day worldwide, while large earthquakes of magnitude 7 and larger occur more than once a month. The National Earthquake Information Center now locates about 20,000
on April 16, 2022
Where are trace fossils found?
GeologyTrace fossils are best preserved in sandstones; the grain size and depositional facies both contributing to the better preservation. They may also be found in shales and limestones. Where can you find a trace fossil? Trace fossils most often were created in soft sediments, and are usually preserved only if the sediment remains undisturbed until