PPSD analysis carried out for a) station VMAR in northern Costa Rica for the Honduras earthquake in 2018 and b) station PEZE in southern Costa Rica for the Türkiye-Syria earthquake in 2023. For both events, we computed PPSDs every 900 seconds during the 60 minutes before the P-wave arrival (red curves) and every 900 seconds during the 60 minutes after the arrival of the surface waves (blue curves). Notice that dark blue lines indicate PPSDs computed immediately after the arrival time of the surface waves, whereas light blue represents PPSD calculations performed for data collected after more time had elapsed. The reverse is shown for the red curves, where darker red indicates one hour before the P-wave arrivals and lighter red indicates proximity to the P-wave arrival times. Credit: Hajaji and Chaves, 2024, CC BY-NC-ND 4.0

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PPSD analysis carried out for a) station VMAR in northern Costa Rica for the Honduras earthquake in 2018 and b) station PEZE in southern Costa Rica for the Türkiye-Syria earthquake in 2023. For both events, we computed PPSDs every 900 seconds during the 60 minutes before the P-wave arrival (red curves) and every 900 seconds during the 60 minutes after the arrival of the surface waves (blue curves). Notice that dark blue lines indicate PPSDs computed immediately after the arrival time of the surface waves, whereas light blue represents PPSD calculations performed for data collected after more time had elapsed. The reverse is shown for the red curves, where darker red indicates one hour before the P-wave arrivals and lighter red indicates proximity to the P-wave arrival times. Credit: Hajaji and Chaves, 2024, CC BY-NC-ND 4.0

PPSD analysis carried out for a) station VMAR in northern Costa Rica for the Honduras earthquake in 2018 and b) station PEZE in southern Costa Rica for the Türkiye-Syria earthquake in 2023. For both events, we computed PPSDs every 900 seconds during the 60 minutes before the P-wave arrival (red curves) and every 900 seconds during the 60 minutes after the arrival of the surface waves (blue curves). Notice that dark blue lines indicate PPSDs computed immediately after the arrival time of the surface waves, whereas light blue represents PPSD calculations performed for data collected after more time had elapsed. The reverse is shown for the red curves, where darker red indicates one hour before the P-wave arrivals and lighter red indicates proximity to the P-wave arrival times. Credit: Hajaji and Chaves, 2024, CC BY-NC-ND 4.0

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