31. Earthquake magnitudes are measures of earthquake size calculated from ground motion recorded on seismographs . 32. Originally, European seismographs were placed in a particular area after a destructive earthquake. 33. The first efforts at this method used manual data reduction from paper seismograph charts. 34. As early as 1922, others were using refraction seismograph recording in the field. 35. However, Arroyo Seco and other municipalities have seismographs installed to monitor the situation. 36. The earthquake broke a seismograph at Marquette University. 37. Sardar Sarovar Narmada Nigam Ltd has installed 9 seismograph stations around Shahada in Maharashtra. 38. Shahada is one of these 9 Seismograph Stations. 39. But don't get your seismograph in a twist _ the pets are spared. 40. The fresh outburst began shortly after 4 a . m ., according to seismographs .
