At least 144 people have been killed and 730 others injured in Myanmar following a powerful earthquake, according to the head of the country's military government. The 7.7 magnitude quake struck around midday local time at a shallow depth of six miles, with the epicentre about 10 miles from the second city of Mandalay. Sky's Tom Clarke explains in more detail what made this earthquake so powerful. Read more: https://news.sky.com/story/at-least-144-killed-in-myanmar-after-earthquake-as-100-