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