Tsunami Current Affairs - 2020

7.5 magnitude Earth Quake hits Russia; 0.3m high Tsunami Waves expected

On March 25, 2020, 7.5 magnitude earthquake hit northern Pacific. The quake was 37 miles deep and stuck the eastern Kuril Islands of Russia.

Highlights

The Pacific Tsunami Warning Centre has warned hazardous Tsunami waves n the coasts of the Kuril Islands. However, the waves are to be less than 30 centimetres in high.

Kuril Islands

The Kuril Islands are a volcanic Archipelago that separates Sea of Okhotsk from the Pacific Ocean. The islands are currently under Russian Administration. However, claims of Japan over 4 southern most islands of the Archipelago have led to the ongoing Kuril Islands Dispute.

The Islands are located at the tectonically instable region called the “Ring of Fire”.

Ring of Fire

The Ring of Fire is the areas of Pacific Ocean where several volcanic eruptions and earthquakes occur. There are more than 452 volcanos in the region. This accounts to 75% of world’s volcanos. Also, 91% of world earthquakes occur in the region.

The Ring of Fire has evolved due to the movement and collisions of lithospheric plates. The eastern section of the ring in the American coast is because of the subduction of Nazca plate beneath the Cocos Plate. In the Northern portion, the Pacific plates is getting subducted. Apart from these there are several smaller tectonic plates that are constantly moving. The energy released during the movement of these plates causes earthquakes and volcanos.

Indian National Centre for Ocean Information launched new Alert System

The Hyderabad based INCOIS (Indian National Centre for Ocean Information) launched a new alert system that will help reduce damage and losses to fishermen due to swell surges. The Swell Surges splash strong waves in the coast damaging boats and nets. The system will help fishermen to get prior alerts about swell surges and safeguard their boats.

Highlights

The INCOIS, an autonomous body operating under Ministry of Earth Sciences launched the alert system that will help provide early warnings about Swell Surges. This is to be launched exclusively for coastal population. The Coastlines of Indian Sub-continent after Tsunami has been experiences damages due to swell waves that originate in distant Southern Indian Ocean.

The Swell Surges are more common in west coast than the east coast.

What are Swell Surges?

A Swell Surge is caused due to surface gravity. They are surface gravity waves and not wind waves (the common waves). Wind Waves are generated by the local winds. On the other hand, swell surges are generated due to distant weather systems.

They take place without any noticeable changes in local winds or coastal environment.