Fig. 5

Cross-correlation functions computed between the observed strain and atmospheric pressure fluctuations for \({L}_{1}\) (blue), \({L}_{2}\) (red), and \({L}_{3}\) (green). The strongest negative correlation corresponds to a time lag between strain and pressure. The dispersed waveform and the influence of background noise may have caused multiple peaks with same levels of amplitude for \({L}_{2}\). These were computed from the records in the periods given in Table 1