Most sources say either 6.9 or 7.1 so i suppose it would be 6.9-7.1
Santa Cruz Mountains (Loma Prieta), California1989 10 18 00:04:15 UTC (Local 10/17/1989)Magnitude 6.9Intensity IX
The 1988 Armenia earthquake (25,000 killed) and 1989 Loma Prieta earthquake (63 killed), both magnitude 6.9.
The last big earthquake in San Francisco occurred on October 17, 1989, known as the Loma Prieta earthquake. It measured 6.9 on the Richter scale and caused significant damage to the city and surrounding areas.
it melted
The Loma Prieta earthquake, which struck Northern California on October 17, 1989, registered approximately 100 aftershocks within the first week following the main event. Over the following months, the total number of aftershocks reached around 1,000, although most were too small to be felt. The largest aftershock measured 6.0 on the Richter scale and occurred just 11 days after the main earthquake.
The 1989 Baseball World Series between the Oakland Athletics and the San Francisco Giants was interrupted. The interruption was due to the Loma Prieta earthquake with a magnitude of 6.9 on the Richter scale.
The October 17, 1989, Loma Prieta, California, Earthquake The October 17, 1989, Loma Prieta, California, Earthquake
The March 11, 2011 earthquake was originally measured at magnitude 8.9, but later upgraded to 9.0 by both USGS and Japan scientists.
The loma prieta earthquake in 1989.
game 3
Loma Prieta
It had an intensity of 8.1 on the Righter magnitude scale. As a means of comparison, it had an intensity of roughly 100 times than that of the 1989 Loma Prieta earthquake.