Ground Motion Records fromM 7.8 Ecuador Earthquake of
April 16, 2016
Praveen K. MalhotraJune 22, 2016
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Acknowledgment• Data processing is preliminary. No warranty of any
kind is assumed• Data may be downloaded from Instituto Geofísico
website: http://www.igepn.edu.ec/servicios/eq20160416
• Data may be viewed at CESMD Virtual Data Center website: http://strongmotioncenter.org/vdc/scripts/event.plx?evt=1317
• Dr. Erol Kalkan of USGS helped access the data
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Recording Stations Relative to Epicenter
Epicenter
AES2
APED
AMNT
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USGS Shake Map and Rupture Area
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Accelerations at APED Station in Pedernales (36 km from Epicenter)East
Up
North
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Resultant Horizontal Accelerations at APED Station in Pedernales
PGA = 1.42 g
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Velocities at APED Station in Pedernales (36 km from Epicenter)East
Up
North
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Resultant Horizontal Velocities at APED Station in Pedernales
PGV = 85.6 cm/s
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Displacements at APED Station in Pedernales (36 km from Epicenter)East
Up
North
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Resultant Horizontal Displacements atAPED Station in Pedernales
PGD = 25.2 cm
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5% Damping Response Spectrum of Horizontal Motion at APED Station in Pedernales
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Acceleration-Deformation Response Spectrum of Horizontal Motion at APED Station in Pedernales
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Accelerations at AES2 Station in Esmeraldas (76 km from Epicenter)
East
Up
North
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Resultant Horizontal Accelerations at AES2 Station in Esmeraldas
PGA = 0.155 g
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Velocities at AES2 Station in Esmeraldas(76 km from Epicenter)
East
Up
North
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Resultant Horizontal Velocities at AES2 Station in Esmeraldas
PGV = 35.1 cm/s
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Displacements at AES2 Station in Esmeraldas (76 km from Epicenter)
East
Up
North
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Resultant Horizontal Displacements atAES2 Station in Esmeraldas
PGD = 17.8 cm
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5% Damping Response Spectrum of Horizontal Motion at AES2 Station in Esmeraldas
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Acceleration-Deformation Response Spectrum of Horizontal Motion at AES2 Station in Esmeraldas
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Accelerations at AMNT Station in Manta(171 km from Epicenter)
East
Up
North
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Resultant Horizontal Accelerations at AMNT Station in Manta
PGA = 0.547 g
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Velocities at AMNT Station in Manta(171 km from Epicenter)
East
Up
North
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Resultant Horizontal Velocities at AMNT Station in Manta
PGV = 55.4 cm/s
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Displacements at AMNT Station in Manta(171 km from Epicenter)
East
Up
North
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Resultant Horizontal Displacements atAMNT Station in Manta
PGD = 29.2 cm
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5% Damping Response Spectrum of Horizontal Motion at AMNT Station in Manta
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Acceleration-Deformation Spectrum of Horizontal Motion at AMNT Station in Manta
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Observations• Ground motions are medium-band• Estimated ground displacements are
somewhat smaller than expected• Strong shaking at AMNT station at 171 km
from epicenter is probably due to its close proximity to the rupture area (Slide 4)
• Unusually long duration at AES2 station is probably due to low-frequency ground shaking at that location. The number of cycles is not unusual