How Earthquake History Has Evolved
The purpose of this article is to give you an overview of how the earthquake history has evolved in the United States. There are four stages in the evolution of earthquake history.
First, there was the initial period when earthquakes were common in this country and no one was quite sure what caused them. One of the major ideas of that time was that the earth’s core was moving towards the west at a constant rate. Scientists also thought that the earth’s core could be strengthened by building dams around it.
In the later stages of this period, scientists found out that earthquake history was not as simple as they had first thought. There were several errors in the original studies that led to the misunderstanding of the earthquake motion. However, it wasn’t until about the 1930s that a consensus regarding earthquake history developed.
Next, the committee found that there had been a considerable amount of aftershocks. This occurred because of the much larger than normal earthquake that was taking place at the time, and also because of the way the system operated. However, it was not until the 1970s that the committee identified these aftershocks as normal.
In the following years, more comprehensive study was conducted with regard to the earthquake history in the United States. In the course of this study, it was discovered that there were several areas of the nation where there had been plenty of aftershocks that were unlikely to have been responsible for the main event.
At this point, there were significant differences in the rules governing the size of fault lines between certain states. These differences were so great that people who were studying earthquake history were left wondering why this was the case.
In addition, it was discovered that there were small areas where the damage was not substantial but there was still a complete event. Allof these differences led to more precise estimates of how many earthquakes there might be in any given year.