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Source: Diving Addiction.
According to the official determination of China's ** Taiwan network, at 3:49 Beijing time on December 4 (3:49 local time on December 4), it occurred in the waters near Mindanao Island in the PhilippinesMagnitude 9**, the depth of the epicenter is 50 km, and the epicenter is located at latitude 890 degrees, 126 east longitude85 degrees.
Epicenter terrain:The average altitude within 5 km of the epicenter is about -5607 meters.
earthquake
The power of the seabed.
The seabed** will not only threaten the safety of maritime vessels, but also may induce submarine landslides, damage submarine fiber optic cables, and threaten the survival of marine life, but its biggest threat to human beings is the tsunami.
Schematic diagram of the tsunami.
***encyclopedia.thefreedictionary.com
When a tsunami occurs, it is not yet imperceptible in the ocean, but as it approaches the shoreline, the energy will continue to gather, and in an instant, a huge wall of water 10 to 30 meters high will be formed, which will pour out in one fell swoop, causing great damage to the coast.
Tsunamis in film and television productions.
For example, in 1958 the Gulf of Litua, Alaska, USA, occurred 8Category 3** caused an iceberg to fall into the sea at a height of nearly 1,000 meters, resulting in an epic tsunami that broke millions of trees on the mountain as the waves hit the mountains on both sides of the bay, reaching an incredible 534 meters at its highest point.
In 1960, a powerful tsunami struck the seabed in south-central Chile, causing a huge tsunami, which surprisingly swept 22 hours and almost half the world to the island of Japan on the west coast of the Pacific Ocean, destroying many houses and boats, and killing thousands of people. Since then, the 2004 Indonesian New Year and Japan** have triggered a massive tsunami and caused serious human resources**.
However, a tsunami is not the same as the bottom of the sea, and tsunamis, volcanic eruptions, landslides, and some meteorological changes can trigger a tsunami.
earthquake
Bottom of the sea** vs continent**.
Some people believe that the ocean floor ** is more terrible than the continent**, and the tsunami that has occurred in the past is used as an example. But in reality, many seafloors** do not necessarily produce tsunamis, with only about 100 out of every 15,000 seafloor tectonics** causing a tsunami.
The factors that form a tsunami mainly include the type of seabed**, the magnitude of the earthquake, and the depth of the water. According to statistics, most of the major losses of people and property in history occurred on land.
earthquake
Effect on diving.
The epicenter is located in the blue area of the map below (Mindanao in the southern Philippines), and we rarely reach this area during the actual diving trip, basically concentrated in the orange area (Luzon and its nearby small islands), and it is believed that this **, the impact on the dive will not be too great.
The above views are not a professional reference, and the specific information is subject to the release of the marine disaster authority.
earthquake
When diving**.
In 2017, Hong (screen name), a diving enthusiast, experienced one of the most memorable scenes of his life.
In April of that year, he flew from Beijing to Manila, Philippines, to begin his long-awaited diving trip.
Hong's destination was a beachfront hotel in Anilao, a dive site nearby. For diving enthusiasts like Hong, this place can satisfy his dream of "diving to eat, eat, sleep and dive", which can be described as a diving paradise.
That night, Hong, who was in a good mood, exchanged glasses with enthusiasts from all over the world at the bar and exchanged their diving experiences. Suddenly, a cold shaking broke the joke, looking at the stirring drink in the cup, Hong immediately realized: **It's over!
Hong's post-earthquake hotel on the Internet was in shambles.
With the riots of the customers in the store, everyone evacuated to the outside in a hurry, and for fear of aftershocks, all the guests spread out on the floor in the open air that night, and while looking at the stars, they changed their tickets for early return.
Faced with such a huge psychological gap, Hong felt a little unwilling, so he planned to stay for a few more days. Since the aftershocks were not very strong, he decided to continue diving three days later. At this time, the water is no different from before, except for a slight turbidity.
However, the scene that he will never forget for a lifetime happened:
At noon on the 8th, he went to sea with his coach and practiced Xi at a shallow seabed (about 8 meters) as planned. After about 20 minutes in the water, he suddenly felt some kind of special sound wave coming from the water, which was sharp and harsh, and even caused him to have a ringing in his ears.
He looked at his companions, and they were all at a loss for what to do. Just as he was about to change his plan and rise to the surface in advance, the sand at the bottom of the sea suddenly shook violently, and the mud and bubbles raised were like boiling water, and the visibility was instantly reduced.
** view of the seabed photographed by Hong.
All kinds of fish and small animals hiding in the coral reef were frightened by this sudden tremor and rushed out. Some of the fish rippled up and down with the sediment, as if they were out of balance.
There was a constant sound of small vibrations from the bottom of the sea, and the sand dispersed like haze. There was a dull thud in the distance, as if rockfall from the shore had smashed into the sea....
Screenshot of the mobile app uploaded by Hong online.
After coming out of the water, Hong hurried back to the shore, and the mobile app showed that a 5A moderately strong earthquake of magnitude 6. Because of the special experience he had just had, at this time, the open land made him feel more at ease than the sea, although above the water, the sea was still unstable.
Little Sweet Potato recently encountered ** material reference when diving in Indonesia: SME Science and Technology Story, China**Taiwan Network, Shanghai Natural History Museum, Xiaohongshu @ Bali Nini.
Extended reading: What would you see if it happened to happen while diving in the sea?Dive booking itinerary
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