Answer:Im going to make this short and sweet declining
The correct answer is - days or years before the major earthquake.
The foreshocks always come before the major earthquake. They can appear only a single day before it, weeks, months, or even years. It is a nice indicator that something bigger is coming, so if people are wary enough they can avoid the devastating effects of the major seismic activity afterwards.
For example, we can take the foreshocks and the major earthquake in Ohrid, Republic of Macedonia, in the summer of 2016, where the foreshocks started about two months earlier, and they were present every day for those two months, slightly increasing in intensity, until the major earthquake of 6.9 magnitude according to the Richter scale came.
Small foreshocks that precede a major earthquake occur days or years before the major earthquake.
Further Explanation:
Earthquake refer to sudden shaking of the ground violently due to volcanic action or movement within the crust of the earth.
Foreshock: It is an earthquake that occurs before occurrence of a large seismic event or earthquake. It is related to space and time. The observation of the foreshocks that are associated with the earthquake reveals that the foreshocks forms a part of the preparation process to nucleation. When earthquake rupture, the process forms a cascade of events, starting from small events like foreshocks that triggers the large events and continue till main shock is triggered.
Example: The 2002 Sumatra earthquake is considered as the foreshock for the 2004 Indian Ocean earthquake and time difference between two events is more than two years.
Therefore, small foreshocks that precede a major earthquake occur days or years before the major earthquake.
Learn more:
1. Learn more about layers of Earth
2. Learn more about earthquake
3. Learn more about climate zones
Answer details:
Grade: High School
Subject: Geography
Chapter: Landforms
Keywords: Small foreshocks that precede a major earthquake occur, from the day of the major earthquake to days after the earthquake, only on the day of the major earthquake, days or years before the major earthquake, only on the day before the major earthquake
-condensation
-triangulation
-intersection
The correct answer is - triangulation.
Triangulation is the technique used for getting the most accurate information about the epicenter of an earthquake. This technique is very simple. Three seismograph stations, on different locations, that are able to record the earthquake, are working together and comparing the results they got from where their respective stations showed the earthquake's epicenter is. The circles that represent the area affected by the earthquake, are than compared and the point of their intersection is considered to be where the epicenter is.
Answer:
Pennsylvania is correct
Explanation:
Brazil has a population concentration in the entire coastal strip of the national territory. This, in a way, is a reflection of the country's historical settlement and demonstrates that the “march to the west” policies adopted in the 20th century were still insufficient to promote a complete interiorization of the population and investments in the geographical space of Brazil.