I think you are right. I believe the Tribulation Period has already begun. As the Apocalypse unfolds, these prophesied events will become more intense, last longer in duration and will increase in frequency. I also believe the natural phenomena of earthquakes and floods are just a prelude (warning) of the geopolitical upheavals that are about to unfold.
Personally I think a "literal" interpretation of Bible Prophecy is somewhat short sighted. The Hebrew word for earthquake translates "a great noise". Earthquakes are known to be preceded by a great "booming" noise in the atmosphere. So it is possible, the reference to "earthquakes" in Bible prophecy may not be limited to actual geological events, but might also refer to geopolitical "upheavals".
Of course, for such geopolitical upheavals to be biblical, they would necessarily have to be of an "unprecedented" scale. Global economic collapse, the invasion and destruction of Israel by Russia, a limited thermo-nuclear war, a Third World War, the destruction of Rome, ect, ect. That's why I say, the massive geological earthquakes and floods we are now seeing around the globe may be "warning" signs of something coming that is going to be far worse than a 7.8 earthquake.
The last 7.8 earthquake that occurred in Japan came in May 2015, just four months before the September 2015 summit in Washington D.C. which included state visits during the same week by the President of Russia, Vladimir Putin, the President of China Xi Jiang Ping and Pope Francis. The September meeting between Putin and the President of the United States resulted in Putin's political rehabilitation for invading the Crimea and supporting the Civil War in the Ukraine and sanctioned Russia's military involvement in Syria and Iraq as our (ally ?!) in the War on Terror. This complete reversal in U.S. policy towards Russian aggression was "unprecedented" and started a firestorm of "criticism" by more than a few members of Congress and foreign policy experts.
Just three months earlier, in July 2015 the U.S. and other world powers finalized a Nuclear Agreement with Iran in Vienna which also ignited a "firestorm" of criticism from its' opponents. With Saudi Arabia now obtaining nuclear missile warheads from Pakistan, it appears the critics where right, and the Iran Deal has precipitated a nuclear arms race in the Middle East.
Is it fair to characterize these events as "unprecedented" political upheavals (earthquakes) ?! I think so. Was the 7.8 earthquake in Japan on May 2015 in such close proximity to these events a coincidence ?!.. I think not. If these massive earthquakes are warning signs, It certainly begs the question, "What might this new 7.8 earthquake in Japan and the 7.8 earthquake in Ecuador yesterday" herald for the future ??? hmmmm. Something to think about, huh ?!