This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. The Hong Kong Observatory detected locally felt tremors from a 4.0-magnitude earthquake in Guangdong province on Friday afternoon, confirming more than 100 reports from residents. The weather forecaster’s initial analysis indicated that the 4.0-magnitude earthquake occurred at 2.28pm in Guangdong’s Yangjiang, with the epicentre located about 260km (161.6...