sentence2_structure: Seismologists<>measured<>the intensity of an earthquake with the mercalli scale<>originally
sentence1: An earthquake measuring 4.2 on the Richter scale struck the central Anatolian town of Afyon on Friday, the state-run Anatolian news agency quoted seismologists as saying.
sentence2: Seismologists originally measured the intensity of an earthquake with the mercalli scale.
question: How did seismologists originally measure the intensity of an earthquake?