What was the magnitude of the 1989 san francisco earthquake?
No context provided
What was the MW magnitude of the 1989 san francisco earthquake?
6.9
No context provided
What was the MS magnitude of the 1989 san francisco earthquake?
7.2
1989 Loma Prieta earthquake
https://en.wikipedia.org/wiki/1989%20Loma%20Prieta%20earthquake
The moment magnitude scale (MMS; denoted explicitly with Mw  or Mw, and generally implied with use of a single M for magnitude[1]) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment.
Moment magnitude scale
The surface-wave magnitude scale, variously denoted as Ms, MS, and Ms, is based on a procedure developed by Beno Gutenberg in 1942[39] for measuring shallow earthquakes stronger or more distant than Richter's original scale could handle.
Seismic magnitude scales
There are several magnitude scales for measuring the size of an earthquake. The 1989 San Francisco earthquake's MW magnitude, or moment magnitude scale magnitude, was 6.9. The earthquake's MS magnitude, or surface-wave magnitude scale magnitude, was 7.2.