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NESS is a flat-file of ground-motion parameters and related metadata of manually processed near-source waveforms from moderate-to-large worldwide events.
NESS flat-file is compiled according to the following criteria:
January 2020: The new version 2.0 of NESS has been published!
What’s new in NESS2:
NESS (v.2.0) is distributed in two '.zip' files:
NESS_flat-file_2020.zip
md5 checksum: 22e0d9f1460e2f2c5a34800d047302b5
NESS_flat-file_eBASCO_2020.zip
md5 checksum: 700664acf2b535b113fc3a45bc6c6387
In the flat-files, the Intensity Measures are flagged as:
U, V, W are the waveform components oriented according to '_*azimuth_deg' fields and not only to the North-South, East-West, and vertical directions (see http://www.fdsn.org/seed_manual/SEEDManual_V2.4.pdf, pag. 134).
FP and FN waveform components are oriented according to the fault strike and fault strike+90°, respectively.
RotD50 and RotD100 are the median and maximum value of the intensity measures distribution, obtained from rotated waveforms.
The identification of pulse-like ground motions from within the NESS2 employs the algorithms developed by Baker (2007) and by Shahi and Baker (2014). Both algorithms use a continuous wavelet transform of a single-component's velocity time history to assign a Pulse Indicator (PI) score and share a common definition of pulse period, namely the pseudo-period of the extracted wavelet that qualifies as a pulse. The algorithm in Baker (2007) is applied to all non-trivial horizontal orientations of each station's records and the PI score and lateness indicator (to exclude records with late arriving pulse) are recorded without imposing any limits on peak ground velocity (PGV) as originally suggested by Baker. Furthermore, the result of the Shahi and Baker (2014) criterion is obtained and recorded for each pair of horizontal components. In a first stage, ground motions with a PI>0.85 according to Baker (2007) that also exhibit PGV>20 cm/s and/or trigger both criteria are flagged as pulse-like. In a second stage, all remaining ground motions that either trigger the Shahi and Baker (2014) criterion alone or exhibit a PI>0.50 are pooled together. These motions are subjected to visual inspection of their velocity traces in the relevant orientations as well as of the azimuthal variation of their PI score. The pulse-like flag is also attributed to some of the ground motions in the second pool based on expert judgement. It should be noted that the pulse-like waveforms identified in this manner may be due to various effects such as rupture directivity, site response (geotechnical) effects and hanging wall or basin wave entrapment effects; the pulse-like flag attributed to some of these ground motions is based on the characteristics of the signal and is not intended to distinguish among these causal effects.
Baker J.W. (2007) Quantitative classification of near-fault ground motions using wavelet analysis, Bulletin of the Seismological Society of America, 97 (5), 1486- 1501.
Shahi, S.K. and Baker, J.W. (2014) An efficient algorithm to identify strong velocity pulses in multi-component ground motions. Bulletin of the Seismological Society of America, 104(5), 2456-2466.
If you use the 'NESS2_flat-file.csv' flat-file, cite as:
Sgobba, S., Pacor, F., Felicetta, C., Lanzano, G., D'Amico, M. C., Russo, E., & Luzi, L. (2021). NEar-Source Strong-motion flatfile (NESS), version 2.0 (Version 2.0) [Data set]. Istituto Nazionale di Geofisica e Vulcanologia (INGV). https://doi.org/10.13127/NESS.2.0
If you use the 'NESS2_flat-file_eBASCO.csv' flat-file, cite as:
D'Amico, M. C., Schiappapietra, E., Felicetta, C., Sgobba, S., Pacor, F., Lanzano, G., Russo, E., & Luzi, L. (2021). NEar-Source Strong-motion flatfile from eBASCO (NESS-eBASCO), version 2.0 (Version 2.0) [Data set]. Istituto Nazionale di Geofisica e Vulcanologia (INGV). https://doi.org/10.13127/NESS.2.0_EBASCO
NESS1 (2018): Pacor, F., Felicetta, C., Lanzano, G., Sgobba, S., Puglia, R., D’Amico, M. C., … Luzi, L. (2018). NEar-Source Strong-motion flatfile (NESS) (Version 1.0) [Data set]. Istituto Nazionale di Geofisica e Vulcanologia (INGV). https://doi.org/10.13127/NESS.1.0
This study has been partially developed within the research programs INGV-ReLUIS (Rete dei Laboratori Universitari di Insegneria Sismica) in the framework of the DPC-ReLUIS Agreement 2019-2021 "COntributi Normativi Progetto Azione Sismica (CONPAS)" WP18, funded by the Presidenza del Consiglio dei Ministri - Dipartimento della Protezione Civile (DPC) , Italy and the project RS2 "Earthquake Simulations and Near-Source Effects" under the Agreement DPC-ReLUIS 2014-2018.
The Authors are grateful to the project coordinator, Roberto Paolucci, for supporting and encouraging the development of this work. Authors are also thankful to Andrè Herrero for suggesting how to compute the near-source distance, and Georgios Baltzopoulos (Università degli Studi Federico II di Napoli, Italy) for having identified the pulse-like records. Finally, the authors thank Chiara Maini who contributed to the initial construction of NESS dataset, during her thesis work.
NESS strong-motion flat-files are licensed under the terms of the "Creative Commons Attribution 4.0 International (CC BY 4.0)" License. This means that you are free to share (copy and redistribute the material in any medium or format) and adapt (remix, transform, and build upon the material) the data. The licensor cannot revoke these freedoms as long as you follow the license terms of attribution (you must give appropriate credit, provide a link to the license, and indicate if changes were made).
This site provides access to the parametric table containing NEar-Source Strong-motion parameters and associated earthquake, station and waveform metadata. Although all the parameters have been checked by analysts, no warranty, implicit or explicit is attached to the data. Every risk due to the improper use of data or the use of inaccurate information is assumed by the user.
Sgobba S., Felicetta C., Lanzano G., Ramadan F., D’Amico M., Pacor F. (2021); NESS2.0: An Updated Version of the Worldwide Dataset for Calibrating and Adjusting Ground‐Motion Models in Near Source. Bulletin of the Seismological Society of America; doi:https://doi.org/10.1785/0120210080
Sgobba S., Lanzano G., Pacor F., Felicetta C. (2021); An Empirical Model to Account for Spectral Amplification of Pulse-Like Ground Motion Records. Geosciences; 11, 15. doi:https://doi.org/10.3390/geosciences11010015
Schiappapietra E., Felicetta C., D’Amico M. (2021); Fling-Step Recovering from Near-Source Waveforms Database. Geosciences; 11, 67. doi:https://doi.org/10.3390/geosciences11020067
D'Amico M., Schiappapietra E., Lanzano G., Sgobba S., Pacor F. (2020); Fling-step recovering from near-source waveforms and ground displacement attenuation models, EGU General Assembly 2020, Online, 48 May 2020, EGU2020-22285. doi:https://doi.org/10.5194/egusphere-egu2020-22285
Baltzopoulos G., Luzi L., Iervolino I. (2020); Analysis of Near‐Source Ground Motion from the 2019 Ridgecrest Earthquake Sequence. Bulletin of the Seismological Society of America; 110 (4): 14951505. doi:https://doi.org/10.1785/0120200038
D’Amico M., Felicetta C., Schiappapietra E., Pacor F., Gallovič F., Paolucci R., Puglia R., Lanzano G., Sgobba S., Luzi L. (2018); Fling Effects from Near‐Source Strong‐Motion Records: Insights from the 2016 Mw 6.5 Norcia, Central Italy, Earthquake. Seismological Research Letters; 90 (2A): 659671. doi:https://doi.org/10.1785/0220180169
Pacor F., Felicetta C., Lanzano G., Sgobba S., Puglia R., D’Amico M., Russo E., Baltzopoulos G., Iervolino I. (2018); NESS v1.0: A worldwide collection of strong-motion data to investigate near source effects. Seismological Research Letters. https://doi.org/10.1785/0220180149
You can leave feedback writing to sara.sgobba@ingv.it. Thank you!