On Wednesday night, June 24, 2020, some parts of the capital, Accra were hit by an earth tremor.
This occurred thrice at around 11pm. There were three types of tremor which occurred yesterday, the first one which was described as the foreshock was 3.7, the mainshock which was 4.2 and the aftershock which was 3.7.
The areas which were affected by the earth tremor included Dzorwulu, Lapaz, Weija, Achimota, Gbawe, Madina, Tema among others.
The Ghana Seismic Center, which is under the Ghana Geological Survey Authority (GGSA), is yet to confirm the reason for the tremor.
An earth tremor is a relatively small or short-lived movement of the earth’s surface caused by the same forces that produce earthquakes. Earth tremors are strong enough to be felt by people.
According to Scientists, earth tremors can occur when the force exerted on the rock mass exceeds its strength.
Earth tremors recorded in Ghana
The earliest earthquake recorded in Ghana occurred in 1615 with magnitude greater than 6.0 on the Richter Scale.
There are also records which indicate that an earthquake in 1636 caused havoc in several parts of Axim in the Western Region.
The last three major earthquakes occurred in Ghana in 1862, 1906 and 1939.
The 1862 Accra earthquake had a magnitude of 6.5 on the Richter Scale and caused three fatalities in addition to damages to property.
In 1871 and 1872 , a Magnitude 4.6 and 4.9 seismic events also occurred in Accra.
The epicentre of the 1906 earthquake was near Ho collapsing buildings and causing severe damage.
The June 1939 magnitude 6.5 earthquake, which was centred around James Town, was the most destructive in Ghana’s history, causing an estimated $67.3 million damage at the time.
This seismic event lasted about thirty seconds and killed 17 people and injured about 140 persons.