Ground Motion Record fromM 6.2 Norcia, Italy Earthquake of

August 24, 2016

Praveen K. MalhotraAugust 26, 2016

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Acknowledgment• Data processing is preliminary. No warranty

of any kind is assumed• Data may be obtained from Italian National

Strong Motion Network (RAN) managed by the Department of Civil Protection (DPC): http://ran.protezionecivile.it/IT/index.php

• Professor Fabrizio Paolacci and Ms. Lucina Corradi helped access the data

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Accelerations in Norcia14 km from Epicenter

East

Up

North

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Resultant Horizontal Accelerations in Norcia 14 km from Epicenter

PGA = 0.454 g

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Velocities in Norcia14 km from Epicenter

East

Up

North

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Resultant Horizontal Velocities in Norcia14 km from Epicenter

PGV = 30.1 cm/s

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Displacements in Norcia14 km from Epicenter

East

Up

North

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Resultant Horizontal Displacements in Norcia 14 km from Epicenter

PGD = 8.6 cm

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5% Damping Response Spectrum of Horizontal Ground Motion in Norcia

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Central Period & Normalized Velocity

• Central period,Tc = 2π (PGD/PGA)0.5 = 0.9 sHence, medium-frequency ground motion

• Normalized velocity,PGVn = PGV/(PGD·PGA)0.5 = 0.5Hence, medium-band ground motion

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Acceleration-Deformation Response Spectrum of Horizontal Ground Motion in Norcia

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Observations• High deformation demand on weak

structures with lateral strength < 25% of weight. Hence, damaging to weak, brittle systems

• Duration and number of cycles are consistent with the magnitude of earthquake

• Medium-frequency, medium-band ground motion