There are undoubtedly other plausible explanations for this offshore "earthquake"

Florida Earthquake Reported Caused By Obama-Clinton Attempt To Destroy Israeli Sub
By: Sorcha Faal, and as reported to her Western Subscribers
Sep 7, 2016
http://www.whatdoesitmean.com/index2111.htm

A stunning (but mostly secret) Ministry of Defense (MoD) report circulating in the Kremlin today states that the United States Navy “swiftly retaliated” yesterday against one of Obama-Clinton’s “private armies” who on 3 September attempted to destroy an Israeli submarine in the waters off the coast of Florida—and that was in that region to “observe/report on” the launching of the AMOS-6 satellite aboard a SpaceX rocket that was ordered destroyed last week by President Obama.

[Note: Obama-Clinton hatred of both Russia and Israel is due to neither of these nations acceptance of what is called open border globalization]

As the Security Council (SC) had previously reported (China Enraged After Obama Orders SpaceX Rocket Destroyed On Florida Launch Pad), last week the Obama-Clinton regime ordered the destruction of the AMOS-6 satellite in order to prevent the sale of the Israeli company Spacecom to China’s Beijing Xinwei Technology Group—and that the successful launching of this satellite was contingent on.

Sent to “observe/report on” the launching of the AMOS-6 satellite from Florida’s Cape Canaveral, this MoD report says, was Israel’s newest Dolphin class submarine INS Rahav—but that less than 48 hours from the 1 September destruction of the SpaceX Falcon 9 rocket by a X-47B drone, was itself attacked on 3 September by a massive underwater explosion caused by the dropping into the waters off the Florida coast of a “special device”, and was so powerful it caused a 3.7 magnitude earthquake to occur.

Though the characteristics of the “special device” dropped into the Florida waters meant to destroy the INS Rahav remain above this reports classification level, the MoD does notes that it was “deployed/released” by a Sikorsky S-61N helicopter owned by the secretive Obama-Clinton “private army” named AAR Corp—and whose Chairman and CEO, David Storch, as a powerful member of the Economic Club of Chicago, paid Hillary Clinton millions-of-dollars for “speeches” she gave to this secretive organization in “payment” for the contracts she gave them while she was Secretary of State.

In order to “cover-up/disguise” the 3 September Florida earthquake this Obama-Clinton attack upon the INS Rahav caused, this report continues, the propaganda US media reported that it was due to a “stress-shock” test done against the littoral (close to shore) combat ship USS Jackson—but with their failing to note that on 20 July, the US Navy reported that the last of these “stress-shock” tests for the USS Jackson had been completed in the middle of July.

And in what MoD analysts in this report call a “swift retaliation”, the same US Navy “directed/controlled” X-47B drone that destroyed the AMOS-6 satellite on 1 September, yesterday, likewise, destroyed the AAR Corp. Sikorsky S-61N helicopter that had attacked the INS Rahav—with local US media reports stating only that it crashed and exploded in central Florida - despite not showing signs of distress beforehand.

This report concludes by noting that some MoD intelligence analysts believe that the downing of this helicopter was not retaliation, but meant to “cover-over/silence” the AAR Corp. crew members who attacked the INS Rahav, and who are all now dead—and point to the same thing currently occurring in Syria where the Pentagon and CIA are now reported to be at war with each other too.