Table 2.—Number of shocks occurring between the dates of the equinoxes and solstices, for thirteen years.
| Table. | Sept. 20th to March 20th. | March 20th to Sept. 20th. | Dec. 21st to June 21st. | June 21st to Dec. 21st. |
|---|---|---|---|---|
| 1850 | 1 | 4 | 2 | 3 |
| 1851 | 2 | 4 | 5 | 1 |
| 1852 | 2 | 2 | ||
| 1853 | 10 | 5 | 8 | 7 |
| 1854 | 5 | 7 | 6 | 6 |
| 1855 | 8 | 4 | 4 | 8 |
| 1856 | 7 | 9 | 9 | 7 |
| 1857 | 9 | 8 | 8 | 9 |
| 1858 | 4 | 3 | 3 | 5 |
| 1859 | 6 | 2 | 2 | 6 |
| 1860 | 4 | 3 | 1 | |
| 1861 | 1 | 1 | ||
| 1862 | 1 | 1 | 1 | 1 |
| 1863 | 3 | 3 | 3 | 3 |
| Total | 64 | 52 | 54 | 60 |
I regret that my records of the occurrence of earthquakes upon the east coast of the United States is not more complete than it is, and also that it does not extend through an equivalent period of time as our own, from 1850 to date; but I have no authentic records of their occurrence on the other side later than 1854; my business at that time, and the subsequent period that has elapsed, being such that I was not able to maintain their continuation. In order to prove the statement made on a preceding page correct as to our relative immunity on this coast over equal extent of territory, I here subjoin the totals on both coasts during that period of time. This statement will also include those shocks which were matters of record belonging to the West India Islands, and which properly belong to the eastern-coast series.
The figures relating to this matter, stands thus:
In California during 1850, five shocks; 1851, six shocks; 1852, two shocks; 1853, thirteen shocks; 1854, eleven shocks. Total, thirty-seven shocks.
In United States, east coast. 1850, three shocks; 1851, seven shocks; 1852, ten shocks; 1853, thirteen shocks; 1854, eleven shocks. Total, forty-four shocks.
Balance against east coast, seven shocks.
West India Islands. 1852, seven shocks; 1853, three shocks; 1854, one shock. Total, eleven shocks.
These inclusive with the continental series foot up eighteen days on which shocks occurred in excess of this coast during the same period of time, and thus shows a margin of greater frequency of little more than thirty per cent.