Explosion triggered near new US Navy aircraft carrier during shock trials registered as 3.9 magnitude earthquake

• The US Navy triggered a big explosion near its new aircraft carrier Friday during shock trials.
• The explosion registered as a 3.9 magnitude earthquake, USNI News reported.
• Shock trials test the hardness of the ship to determine if it can withstand harsh battle conditions.

The US Navy triggered an explosion near its new aircraft carrier, USS Gerald R. Ford, off the US East Coast on Friday during shock trials, and the big blast registered as a 3.9 magnitude earthquake, USNI News reported, citing US Geological Survey data.

The US government agency recorded the activity as an "experimental explosion" about 100 miles off the coast of Florida, where a Navy spokesperson confirmed to Insider the Ford is undergoing shock trials.

Shock trials test a ship's ability to withstand brutal battle conditions, specifically the detonation of ordnance nearby. By setting off controlled explosions near Navy ships, the Navy can identify critical shock-related vulnerabilities.

The Navy released video footage of the explosive shock trials from different angles.

The following Navy video, which appears to have been taken from aboard the Ford, shows the intensity of the nearby explosion.

USS Gerald R. Ford, a first-in-class vessel and the Navy's most advanced aircraft carrier, was "designed using advanced computer modeling methods, testing, and analysis to ensure the ship is hardened to withstand battle conditions, and these shock trials provide data used in validating the shock hardness of the ship," the service said.

Commenting on the results of the first explosive event, posts on the Ford's official social media pages said that "the leadership and the crew demonstrated Navy readiness fighting through the shock, proving our warship can 'take a hit' and continue our mission on the cutting edge of naval aviation."

The Navy explained in a Facebook post on the testing that it "conducts shock trials of new ship designs using live explosives to confirm that our warships can continue to meet demanding mission requirements under harsh conditions they might encounter in battle."

Shock trials were born from observations during World War II, a 2007 Navy-sponsored study said.

During the war, the Navy discovered that while "near miss" explosions did not severely damage the hull or superstructure of ships, the shock from the blast would knock out key system and cripple the vessels.

In response, the study explained, the Navy created a "rigorous shock hardening test procedure" known as shock trials.

The latest shock trials involving the Ford are the first aircraft carrier trials since those involving the Nimitz-class aircraft carrier USS Theodore Roosevelt in 1987.

The Navy said that the trials are being conducted in a way that "complies with environmental mitigation requirements, respecting known migration patterns of marine life in the test area."

The service also stated that it "also has employed extensive protocols throughout [full-ship shock trials] to ensure the safety of military and civilian personnel participating in the testing evolution."