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"Identical Acoustic Waveforms Found Between Different-Sized Outbursts: " by Yang Lei, Yuanping Cheng et al.

Every gigantic Coal and Gas Outburst begins as a tiny, localized coal failure. This point of failure leads to a rupture of the coal seam, resulting in a violent ejection of enormous amounts of gas and pulverized coal. Whether the size of an outburst is predictable and whether a large-scale outburst requires unique conditions different from smaller events are fundamental questions associated with the potential for disaster probabilistic forecasting. In this study, we conducted a series of outburst simulations using carbon dioxide (CO2) and He and recorded acoustic signals in the frequency band 0.5–50 Hz during each outburst. We established that the cross-correlation coefficients of initial waveforms between Different-Sized Outbursts are generally high, which provides evidence for identical onsets of large and small events. Therefore, we focused on the self-similar properties of rupture growth and developed a viable model to explain the outburst mechanism. In our model, every outburst ....

Gas Outburst , Different Sized Outbursts , Acoustic Waveform , Gas Desorption , Utburst Simulation , Ropagation Mechanism ,

"Evidence for universal rupture behavior during coal and gas outbursts" by Yang Lei, Yuanping Cheng et al.

Every catastrophic coal and gas outburst begins as a tiny coal failure at almost a point, followed by violent ejection of enormous amounts of gas and pulverized coal. Whether the initial rupture of a large outburst produces observable signatures different from those of smaller events is a fundamental question associated with the potential for outburst prediction. Although outburst processes have been investigated both experimentally and theoretically, the underlying mechanism responsible for outburst rupture behavior is still poorly understood. Here, we performed a series of physical simulations and recorded the infrasound during each outburst. We found that a sharply high-amplitude (∼300 Pa) pressure wavelet followed by long (∼1 s) low-pressure acoustic waves is a common feature of outburst-generated infrasounds. These pulse-like waveform signatures have been observed during explosive volcanic eruptions, suggesting that outburst dynamics can be characterized as gas-driven eruption ....

Energy Analysis , Utburst Simulation , Upture Behavior ,