The Catastrophic Impact of Tsunami: Understanding Ocean Wave Surges and Their Destructive Power

Abstract

Meaning of a tsunami A tsunami is a catastrophic ocean wave that sends water surges (Bachay et al., 2022). These series of ocean waves build up in heights reaching up to 100 feet on land. Since they are strong water waves, tsunami causes widespread destruction when they crash ashore. Interestingly, these catastrophic ocean waves do not dramatically increase in height out in the ocean's depth. On the contrary, when these oceanic waves travel inland, they build up to higher and higher heights. Such drastic heights happen as the depth of the ocean decreases. According to (Scourse et al., 2018), the speed of ocean waves varies depending on the ocean depth regardless of the distance of the source. These catastrophic ocean waves travel as fast as a jet in deep waters, and the speed lowers when the waves hit shallow waters, implying that the impact of such waves when in deep water is high and thus can cause severe destruction to anything they come in contact with before hitting the shallow waters. Tidal waves are, to some extent, associated with the tsunami, but it is imperative to note that tidal waves are not potentially able to cause giant waves that define a tsunami. For this reason, a tsunami is a catastrophic series of ocean waves that comes in the form of massive waves defining adverse effects on waters and the earth (Scourse et al., 2018). Origin and Development An impulse plays a significant role in the formation of a tsunami. What does this imply? When an earthquake or any other generating impulse occurs, waves propagate a great distance from the ocean surface. These waves are in the form of ever-widening circles, which can move at a speed of 800km in deep waters. The length of a tsunami varies based on the water levels. However, sometimes in deep waters, these wavelengths exceed 500kms with substantially lower heights of about 30 to 60 centimeters. Wave periods also vary from a few minutes to hours but last very long before any crest passes a single point enabling them to be entirely obscured in deep waters by regular wind waves (Scourse et al., 2018). The velocity of these waves reduces with the friction of the rising sea bottom, shortening the wavelengths while the wave height increases. At this point, the coastal waters may rise about 100 feet above normal sea levels, enhancing oscillation of continental shelf waters and leading to adverse damages. Due to the strength of rushing waters, they may uproot trees, carry boats far ashore, displace buildings from their foundation, and wash away beaches, among other damages that may lead to fatalities in severe cases. However, it is wise to note that tsunami effects vary from place to place. People may wonder what defines a tsunami upon its arrival at the coast. It is imperative to note that the initial arrival of a tsunami at the coast may be in the form of a wave trough as first witnessed in the bay of Lisbon, Portugal, on November 1st, 1755, attributed to a massive earthquake (Fonseca, 2020). Types of Tsunamis There are several tsunamis whose experiences have left significant impacts on the victims and the witnesses. However, it is imperative to note that researchers classify tsunamis based on their effects. Nevertheless, local, regional, and distance tsunamis are the primary types of tsunamis experienced globally. According to Sandanbata et al. (2020), coastal landlines, submarine volcanoes, and submarine sediment slumping are the leading causes of a local tsunami. As Necmioğlu et al. (2019) put it, a “local tsunami causes damage near the effect that triggered it thus proves the most dangerous as offers little to no warning between the triggering event and the arrival of the tsunami.” Earthquakes trigger local tsunami occurs within 60 miles of land damage that serves as the primary outcome of this type of tsunami. The period between the underwater occurrence and the arrival of the tsunami varies, defining the destructive nature of the local tsunami as people have insufficient time to ensure a thorough evacuation. In such a case, the levels of effects tend to be adverse compared to other types of tsunamis. Regional tsunamis differ significantly from local tsunamis based on the nature of their effects attributed to distance levels. Unlike local tsunamis that cause damage at a close range from the source that triggered the tsunami, regional tsunamis cause damage further from their triggers. What does this imply? These types of tsunamis have more extended warnings to the people, which enhance complete evacuation to ensure safety when the tsunami arrives. Regional tsunami takes over 50% of the tsunamis experienced globally, leaving adverse effects on humans and the environment. Though regional tsunamis cause damages between a hundred and a thousand kilometers or even further, their longer distances or warnings do not limit their effects on the environment and humans within such distances. Hawaii serves as a nation that has experienced regional tsunamis in the best part of the 20th century, with April 1st, 1946, serving as the worst tsunami date claiming the city of Hilo. It is imperative t note that though a regional tsunami gives people a significantly longer warning time than a local tsunami, one to three hours might prove too little for a complete evacuation...