The largest earthquake of the 20th century, measuring 9.5 on the Richter scale, occurred in Chile on May 22, 1960. This earthquake is also known as the Great Chilean earthquake and is considered to be the most powerful earthquake ever recorded in history. The earthquake was so powerful that it triggered a tsunami that caused further devastation along the coast of Chile and in other countries around the Pacific Ocean, including Hawaii and Japan.

The country that experienced the largest earthquake of the 20th century, measuring 9.5 on the Richter scale, is Chile. This powerful earthquake occurred on May 22, 1960, near the southern coast of Chile. It is commonly known as the Great Chilean Earthquake or the Valdivia Earthquake.

The seismic event had devastating consequences, causing widespread damage, triggering tsunamis that affected distant coastlines across the Pacific Ocean, and resulting in significant loss of life. The earthquake's immense magnitude and the subsequent tsunamis left an indelible mark on the geological and historical record, making it one of the most powerful earthquakes ever recorded.