The 1974 Zhaotong earthquake occurred at 19:25 UTC on 10 May. It had a magnitude that was measured at 7.0 on the moment magnitude scale and 7.1 on the surface wave magnitude scale. It had a maximum perceived intensity of IX ("Violent") on the Mercalli intensity scale. The epicenter was located in Zhaotong prefecture in Yunnan province and it caused between 1,641 and 20,000 deaths.
There was a difference of one tenth of a point between the two measured magnitudes on the two different scales.
( z1 differ :ARG1 ( z2 magnitude :quant 2 :ARG1-of ( z3 measure ) ) :ARG3 ( z4 point :quant "1/10" ) :location ( z5 scale :quant 2 :ARG1-of ( z6 differ ) ) )