Batu Tara is an active but poorly studied volcano located in the Lesser Sunda Archipelago (Indonesia). Its last known long-lasting eruptive phase, dating 2006–2015, was characterised by frequent short-lived explosions, similar in style and magnitude to those of the well monitored Stromboli volcano (Italy). On September 2014, we collected high-frequency multi-parametric measurements of the ongoing explosive activity to investigate the dynamics of intermediate-size volcanic explosions. We acquired synchronized acoustic, thermal and visible high-speed imaging data, and parameterized different spatial and temporal properties of each explosive event: i) maximum height and ejection velocity of bombs and plumes, ii) duration, iii) amplitude of acoustic and thermal transients, iv) acoustic and thermal energy, v) spectral features of the acoustic signals. The latter ones justify the assumption of a pipe resonance of the uppermost conduit section, likely in response to the arrival of over-pressurized gas at the free magma surface. The variability of the investigated parameters agrees with previous observations of intermediate-size explosions at other volcanoes, reflecting the complexity of the related source processes.

tu都塔拉（Batu Tara）是位于小苏达群岛（印度尼西亚）的一座活泼但研究不多的火山。其最后一次已知的持久喷发期可追溯到2006-2015年，其特征是频繁发生的短暂爆炸，其样式和大小与受到良好监测的斯特龙博利火山（意大利）相似。2014年9月，我们收集了正在进行的爆炸活动的高频多参数测量结果，以研究中型火山爆发的动力学。我们获取了同步的声，热和可见高速成像数据，并对每个爆炸事件的不同时空特性进行了参数化：i）炸弹和烟羽的最大高度和弹射速度，ii）持续时间，iii）声和热瞬变的幅度，iv）声能和热能，v）声信号的频谱特征。后者证明了最上部导管部分的管道共振的假设是合理的，这可能是由于超压气体到达自由岩浆表面所引起的。所研究参数的可变性与先前在其他火山中中等规模爆炸的观察结果一致，反映了相关震源过程的复杂性。