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S.K. Singh et al. | 1855Table 4. Effective duration, Te, of accelerograms at OXLC.Date Te at OXLC, sNS EW Z15/06/1999 43.2 46.8 53.030/09/1999 30.5 25.9 32.820/03/2012 23.2 38.0 42.908/09/2017 30.7 26.2 45.119/09/2017 39.0 35.7 55.923/06/2020 16.6 18.5 34.7 15.1* 16.7* 27.9**Te at mid-height site during the 23/06/2020 earthquake.Figure 5. Acceleration, velocity, and displacement recorded during 23/06/2020 Huatulco earthquake at (a) OXLC and (b) mid-height of MAPN. Numbers above the traces in (a) and (b) are peak values. Note that velocity and displacement at both sites are nearly the same but acceleration at MAPN is amplified. (c) Comparison of observed Sa during 23/06/2020 at the mid-height sensor located at MAPN (blue dash) with estimated Sa using OXLC recording and observed spectral ratio between mid-height, MAPN and OXLC (blue). Red curve shows estimated Sa when the median spectral amplification for shallow events is used in the calculation. At longer period (T > 0.5 s) the curves overlap each other but at shorter periods the red curves are generally higher which is consistent with possible nonlinear behavior during the 2020 event. E1 OXLC, 2020 OXLC, 2020 OXLC, 2020 350 35 20 300 30 73 8.5 15 250 25 N 200 20 10 V, V, '-- 150 '-- 15 s s 83 s 10.0 (J (J (J 100 10 5 50 5 30 6.1 0 0 0 m 40 BO 40 BO 40 BO MAPN, 2020 MAPN, 2020 MAPN, 2020 350 35 20 300 30 3.3 128 9.1 15 250 25 N 200 20 10 4.4 V, V, '-- 150 '-- s s 15 r 10.3 s 110 (J (J (J 5 100 10 50 5 4.1 56 6.0 0 0 0 40 BO 40 BO 40 BO Time, s Time, s Time, s B Mid-height, MAPN, 2020, N Mid-height, MAPN, 2020, E Mid-height, MAPN, 2020, Z 103 103 t 103 N V, 102 102 102 '--s !! l (J ti 101 101 ff 101 (/} 10%u00b0 10%u00b0 100 10-2 10- 1 10%u00b0 101 10- 2 10- 1 10%u00b0 101 10- 2 10-1 10%u00b0 101 Period, s Period, s Period, s