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[ad_1] Melbourne shook when a 4.3 magnitude earthquake at a depth of three kilometres at Rawson, east of the Victorian capital, took off in the early hours of Friday morning. Within 25 minutes, the Joint Australian Tsunami Warning Centre (JATWC) – a partnership of Geosciences Australia and the Bureau of Meteorology – declared ‘no tsunami threat.’ Why? The JATWC will usually conduct assessments for such events when an earthquake over magnitude 6.5 within 200km of territorial coastline – that includes small offshore islands like Christmas or Norfolk islands. “Due to the size and location of this earthquake, there was no chance of a tsunami generating and therefore the no threat bulletin was issued to alleviate concerns for anyone near the coast who felt the earthquake,” a Bureau spokesperson tells Cosmos. But a bulletin must still be issued, as a matter of procedure. The JATWC issued a no threat bulletin following the Rawson earthquake on June 30. Credit: Bureau of M...