Editing 1810s (section)

==Natural events==
* December 16, 1811 – The [[New Madrid earthquake]] in [[Mississippi Valley]] near [[New Madrid, Mississippi|New Madrid]] reverses the course of the river for a while. Other earthquakes along the fault occur on January 23, 1812, and February 7, 1812.
* February 7, 1812 – The last [[New Madrid earthquake]] strikes [[New Madrid, Missouri]], with an estimated [[moment magnitude scale|moment magnitude]] of over 8;
* March 26, 1812 – An [[1812 Caracas earthquake|earthquake]] destroys [[Caracas]], [[Venezuela]].
* April, 1817 – An [[earthquake]] strikes [[Palermo]], Italy.
* August 23, 1817 – An earthquake near the site of the ancient Greek city of [[Helike]] results in 65 deaths.

===Year Without a Summer===
[[File:1815 Tambora Sumbawa explosion path large.jpg|thumb|upright=1.2|right| April 5–April 12: [[Mount Tambora]] explodes, changing climate.]]
{{Main|Year Without a Summer}}
* April 5–April 12, 1815 – [[Mount Tambora]] in the [[Dutch East Indies]] blows its top explosively during an eruption, killing upwards of 92,000 and propelling thousands of tons of aerosols ([[Sulfide]] gas compounds) into the upper atmosphere ([[stratosphere]]). The following year (1816) becomes known as "Year Without a Summer", as the high level gases reflect sunlight and cause the widespread cooling (known as a [[volcanic winter]]) and heavy rains, snows in June and July in the northern hemisphere, and widespread crop failures.