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The precursory effects from several earthquakes upon the two subionospheric transmitted signals, one 19.8kHz from North West Cape, Australia (lat: 21.82°S; long: 114.16°E) and the other 40kHz from Fukushima, Japan (lat: 37.37°N; long: 140.85°E), are studied from the recorded data at Kolkata (lat: 22.56°N, long: 88.5°E). Some spiky transients are observed. Spike height and spike intensity are dependent...
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