ScienceWhy recent major quakes don’t mean the planet is shaking more

Recent magnitude 7-plus earthquakes in Mexico, Colombia, Venezuela, Japan, the Philippines and Indonesia have killed and injured thousands, raising fears that earthquakes are becoming more frequent. US Geological Survey data show that temporary fluctuations are normal, with about 133 magnitude 6-plus quakes annually. Death tolls also depend on location, building standards and wealth, particularly along fault zones and the Pacific Ring of Fire.