Western Australia (WA) has seen an unusual surge of tremors with a magnitude 4.7 earthquake forming the largest of the nearly 70 recorded in the last three weeks. However, experts say the cause of the swarm is unknown, with the possibility of a larger event in the near future not out of the question. “There’s no good explanation as to why swarms occur,” GA senior seismologist Tania Pejic told 6PR. “So they’re really poorly understood.” The 4.7 magnitude rumble was recorded 30 kilometres (20 miles) west of Wagin in the early morning of Jan. 25, but was felt as far away as the state’s capital, Perth, around 230 kilometres north-west. Residents of Wagin reported having been woken up after their bed began to shake, along with experiencing wobbling roofs and rattling windows. According to the residents, tremors had been an ongoing occurrence over the last several weeks. The region has …