2.【答案】 B 【解析】 根据第二段的 T he point where an earthquake starts is called its focus可知,地震开始的地 方称为震源。 3.【答案】 C 【解析】 根据第二段的 When rocks along the fault mov e. T he ground shakes. T hat's an earthquake 可知,形成断层后,并且当岩石沿着断层移动时,...
{and S waves are slower and travel between 3.5 and 7.5km s-1.In earthquake seismology, the time interval between the first arrivals of transverse (S)and longitudinal (P) waves, is proportional to the distance from the earthquake source.In order to locate the epicenter of an earthguake you...
According to Ji, though 7.4-magnitude earthquake is considered a strong earthquake, it actually can happen more than 10 times a year in the world. Compared to the 2011 earthquake, this earthquake seemed to be stronger to people in Fukushima. This is because the epicen...
Direct students to the Virtual Earthquake Web site, which is a tutorial to guide students through the process of determining earthquake epicenters and magnitudes, as discussed in the previous activity. This tutorial is both a problem-solving activity as well as an active learning activity. Students...
Textbooks commonly illustrate earthquake P and S wave shadow zones using ray tracing techniques with an epicenter at the North Pole and the shadow zone south of the equator. Shadow zones differ for earthquake locations else where. Shadow zones for earthquakes at locations around the world can be ...
The September 20 earthquake was centered nearly 870 kilometers (540 miles) south-southeast of Tokyo, 我们可以推算,这次日本北海道大地震发生在2003年9月26日。 9. D。细节归纳题。这次地震造成的后果有:236 people had been hurt;A fire broke out at oil refinery;a train derailment and a landslide ...
根据第三段 “The researchers found that 90 percent of all reported cases happened within 100 kilometres of the epicenter and within 60 days of an earthquake. Then, they examined when and where foreshocks had happened in the region. 'The space-time pattern of animal precursors and foreshocks...
An earthquake's focus refers to the origin of the rupture, whereas an epicenter is the point on the Earth's surface that is directly above the focus...Become a member and unlock all Study Answers Try it risk-free for 30 days Try it risk-free Ask a question Our experts can answer ...
Fig. 1.Map of the northern South Island and southern tip of the North Island, New Zealand. The epicenter of the Kaikōura earthquake is shown by the USGS focal mechanism. Fault traces outlined inblackare major, previously mapped faults of the Marlborough fault system.Blue linesandnamesindicate ...
However, this tranquility was shattered in an instant when a powerful earthquake struck, sending shockwaves through the community and leaving an indelible mark on everyone's heart. The earthquake began as a subtle tremor, barely noticeable at first. People paused momentarily, looking around with ...