Figure 2 Time series of the Surigao Del Sur earthquake sequence, starting with the magnitude 7.4 mainshock on Dec. 2, 2023 (10:37 p.m., Manila time) with a thrust mechanism at 26-kilometer focal depth, followed by 24 moderate to large events with magnitudes ranging from magnitude 4.9 to 6.8 within three days. The mainshock was followed by three normal fault events, then by alternating thrust and normal faulting events within 24 hours. A day and a few hours later, a magnitude 6.8 thrust faulting event occurred at about the same depth as the magnitude 7.4 event, and the alternating normal and thrusting faulting events was repeated. See text for more discussion. Credit: Aurelio, Catugas, Anicete.

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Figure 2 Time series of the Surigao Del Sur earthquake sequence, starting with the magnitude 7.4 mainshock on Dec. 2, 2023 (10:37 p.m., Manila time) with a thrust mechanism at 26-kilometer focal depth, followed by 24 moderate to large events with magnitudes ranging from magnitude 4.9 to 6.8 within three days. The mainshock was followed by three normal fault events, then by alternating thrust and normal faulting events within 24 hours. A day and a few hours later, a magnitude 6.8 thrust faulting event occurred at about the same depth as the magnitude 7.4 event, and the alternating normal and thrusting faulting events was repeated. See text for more discussion. Credit: Aurelio, Catugas, Anicete.

Figure 2 Time series of the Surigao Del Sur earthquake sequence, starting with the magnitude 7.4 mainshock on Dec. 2, 2023 (10:37 p.m., Manila time) with a thrust mechanism at 26-kilometer focal depth, followed by 24 moderate to large events with magnitudes ranging from magnitude 4.9 to 6.8 within three days. The mainshock was followed by three normal fault events, then by alternating thrust and normal faulting events within 24 hours. A day and a few hours later, a magnitude 6.8 thrust faulting event occurred at about the same depth as the magnitude 7.4 event, and the alternating normal and thrusting faulting events was repeated. See text for more discussion. Credit: Aurelio, Catugas, Anicete.

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