Difference Between an Earthquake of Intensity 7.1 and an Earthquake of Intensity 7.2

Earthquakes are natural phenomena that occur when there is sudden movement or displacement of tectonic plates beneath the earth's surface. They can be very destructive, leading to loss of lives, destruction of property, and other social and economic impacts. The intensity of an earthquake is a measure of the energy released by the earthquake and is calculated on the Richter scale. The difference between an earthquake with intensity 7.1 and an earthquake with intensity 7.2 might seem small, but it can have a significant impact on the destruction caused.

Earthquake of Intensity 7.1

An earthquake with an intensity of 7.1 is considered a major earthquake. It releases a large amount of energy and can cause widespread damage. Here are some key features of such an earthquake:

Magnitude − The magnitude of an earthquake represents the amount of energy released at the earthquake's source. A magnitude of 7.1 indicates a significant release of energy, resulting in strong ground shaking.

Ground Shaking − An earthquake with an intensity of 7.1 produces strong ground shaking, which can cause structural damage to buildings, infrastructure, and other man-made structures. It can also trigger landslides and rockfalls, posing a risk to communities in hilly or mountainous regions.

Aftershocks − Following a major earthquake, there is a possibility of aftershocks. These are smaller earthquakes that occur in the same region and can continue for days, weeks, or even months after the main event. Aftershocks can further damage already weakened structures and hinder recovery efforts.

Impact on Structures − Buildings and infrastructure in the affected area can experience severe damage or collapse during an earthquake with an intensity of 7.1. This can result in injuries or fatalities, depending on the population density and preparedness of the area. The extent of damage may also depend on the construction standards and building codes in place.

Earthquake of Intensity 7.2

An earthquake with an intensity of 7.2 is also classified as a major earthquake. It is slightly stronger than a 7.1 earthquake and has similar characteristics. Here are some key features of such an earthquake:

Magnitude − The magnitude of an earthquake with an intensity of 7.2 indicates a higher release of energy compared to a 7.1 earthquake. This means that the shaking and potential impacts can be slightly more intense.

Ground Shaking − Similar to a 7.1 earthquake, a 7.2 earthquake produces strong ground shaking, which can cause significant damage to structures and infrastructure. The level of shaking may be slightly more severe than in a 7.1 earthquake.

Aftershocks − As with any major earthquake, a 7.2 earthquake can be followed by aftershocks. These smaller earthquakes can occur in the same region and continue for some time, potentially causing additional damage.

Impact on Structures − The impact on structures during a 7.2 earthquake is comparable to that of a 7.1 earthquake. Buildings and infrastructure are at risk of severe damage or collapse, particularly if they are not constructed to withstand strong seismic forces. The vulnerability of structures can depend on various factors, including their age, design, and proximity to the epicenter.

Differences: Earthquake of Intensity 7.1 and 7.2

Now, let's consider the difference between an earthquake with intensity 7.1 and an earthquake with intensity 7.2. An earthquake with intensity 7.1 releases about 32 times more energy than an earthquake with intensity 6.1, while an earthquake with intensity 7.2 releases about 45 times more energy than an earthquake with intensity 6.2. Therefore, we can see that the difference between the two earthquakes is not significant in terms of energy released.

However, the difference in destruction caused can be significant. An earthquake with intensity 7.1 can cause severe damage to buildings and other structures, leading to the collapse of poorly constructed buildings and bridges. It can also cause landslides, tsunamis, and other secondary effects that can cause further damage. On the other hand, an earthquake with intensity 7.2 can cause even more destruction, leading to the collapse of well-constructed buildings and bridges. It can cause widespread damage to infrastructure and disrupt essential services such as water, electricity, and transportation.

Furthermore, the intensity of an earthquake can vary depending on the depth at which it occurs. Shallow earthquakes, which occur within the top 20 km of the earth's surface, can cause more damage than deep earthquakes, which occur at depths greater than 70 km. The depth of the earthquake can also affect the propagation of seismic waves and the way they interact with the surrounding rock and soil.

The following table highlights the major differences between an earthquake of intensity 7.1 and an earthquake of intensity 7.2 −

Conclusion

In conclusion, while the difference between an earthquake with intensity 7.1 and an earthquake with intensity 7.2 may seem small in terms of energy released, it can have a significant impact on the destruction caused. The depth of the earthquake and other factors such as the location, soil type, and building codes can also influence the impact of the earthquake. Therefore, it is essential to take all these factors into account when assessing the potential risk of an earthquake and preparing for its effects.

Vineet Nanda

Updated on: 19-Jul-2023

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