Reflection seismic study of the post-glacial Burträsk fault: Original stack

SND-ID: snd1099-2. Version: 1.0. DOI: https://doi.org/10.5878/gs5z-p737

Citation

Creator/Principal investigator(s)

Christopher Juhlin - Uppsala University, Department of Earth Sciences orcid

Björn Lund - Uppsala University, Department of Earth Sciences

Research principal

Uppsala University - Department of Earth Sciences rorId

Description

In 2008, a 22 km long high resolution reflection seismic profile was acquired over the Burträsk fault in Northern Sweden. The Burträsk fault formed at the end of the last glacial, triggered by the rapid melting of the Scandinavian ice sheet and the following crustal rebound. The aim of the survey was to image the structure of the fault with depth. The profile followed existing roads resulting in a very crooked acquisition geometry. A list of the key acquisition parameters is given below.
The dataset was first processed and published in 2011. In 2018, the dataset was reprocessed using an additional cross-dip correction step to improve the imaging of reflection with a dip component in the cross-profile direction. The following data files are available for downloading:
1) raw shot gathers (decoded and quality controlled, with geometry information in the headers)
2) original stacked section from Juhlin and Lund (2011)
3) cross-dip corrected stacked section from Beckel and Juhlin (2019)
4) cross-dip corrected migrated section from Beckel and Juhlin (2019)
A short summary of the main processing st

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In 2008, a 22 km long high resolution reflection seismic profile was acquired over the Burträsk fault in Northern Sweden. The Burträsk fault formed at the end of the last glacial, triggered by the rapid melting of the Scandinavian ice sheet and the following crustal rebound. The aim of the survey was to image the structure of the fault with depth. The profile followed existing roads resulting in a very crooked acquisition geometry. A list of the key acquisition parameters is given below.
The dataset was first processed and published in 2011. In 2018, the dataset was reprocessed using an additional cross-dip correction step to improve the imaging of reflection with a dip component in the cross-profile direction. The following data files are available for downloading:
1) raw shot gathers (decoded and quality controlled, with geometry information in the headers)
2) original stacked section from Juhlin and Lund (2011)
3) cross-dip corrected stacked section from Beckel and Juhlin (2019)
4) cross-dip corrected migrated section from Beckel and Juhlin (2019)
A short summary of the main processing steps for each dataset is given below. For a complete description, please refer to the above mentioned publications.

Key acquisition parameters:
Number of channels: 280
Near offset: 0 m
Geophone spacing: 20 m
Geophone type : 28 Hz single
Nominal source spacing : 20 m
Source type : VIBSIST
Hit interval between hammer blows : 100-200 ms
Sweeps per source point :3-4
Nominal fold : 140
Recording instrument : SERCEL 408L
Sample rate : 1ms
Field low cut : Out
Field high cut : 400 Hz
Record length : 23 s
Profile length : 22 km
Source points : 799
Dates acquired: 2008/08/05-2008/08/16

Short summary of the main processing steps:
1) BUR_shots_geom.sgy
The raw shot records are pre-processed with VIBSIST decoding, quality control. Information about the shot and receiver geometry has been added to the trace headers.
2) BUR_original_stack.sgy
The processing flow of the original data stack includes trace editing and balancing, spectral equalization, time-variant bandpass filtering, refraction and residual statics, horizontal median filtering, NMO correction, DMO correction, stacking and coherency filtering (for a complete description see Juhlin & Lund, 2011)
3) BUR_crossdip_stack.sgy
The main processing steps of the crossdip stack are very similar to those of the original stack, including trace editing and balancing, spectral equalization, time-variant bandpass filtering, refraction and residual statics, horizontal median filtering, NMO correction, DMO correction, stacking and coherency filtering. Before DMO correction, an additional cross-dip correction step has been added. For a complete description see Beckel & Juhlin, 2019.
4) BUR_crossdip_mig.sgy
The processing flow of the migrated section includes trace editing and balancing, spectral equalization, time-variant bandpass filtering, refraction and residual statics, horizontal median filtering, NMO correction, cross-dip correction, DMO correction, stacking, coherency filtering and migration (for a complete description see Beckel & Juhlin, 2019).

This dataset contains the original stack of the Burträsk profile (Juhlin & Lund, 2011).
Processing steps for this data set:
1. Read decoded VIBSIST data
2. Bulk static shift to zero time
3. Apply geometry
4. Pick first breaks
5. Resample: 2 ms, 1501 samples
6. Trace editing
7. Trace balance: 0-3000 ms
8. Spectral equalization: 25-40-120-150 Hz
9. Time variant bandpass filter:
0-200 ms: 35-70-200-300 Hz
250-500 ms: 30-60-180-270 Hz
600-900 ms: 22-45-135-200 Hz
1100-3000 ms: 20-40-120-180 Hz
10. Refraction statics: datum 200 m, replacement velocity 5500 m s-1, overburden velocity 1600 m s -1
11. Residual statics
12. AGC: 100 ms window
13. Median filter: 11 traces, 3 samples,
5300 m s-1 , subtract
14. Butterworth filter: 20-40-200-300
15. Residual statics
16. Velocity analysis
17. NMO correction: 40% stretch mute
18. DMO
19. Stack
20. Trace balance
21. FX Decon: 19 trace window

Processed seismic data stored as one file for the entire seismic profile, according to SEG technical standard SEG-Y revision 1 (SEG-Y_r1.0, 2002); https://seg.org/Publications/SEG-Technical-Standards Show less..

Language

Method and outcome

Time period(s) investigated

2008-08-05 – 2008-08-16

Data format / data structure

Data collection
  • Time period(s) for data collection: 2008-08-05 – 2008-08-16
Geographic coverage

Geographic spread

Geographic location: Sweden, Skellefteå Municipality

Geographic description: Burträsk fault, northern Sweden

Administrative information

Responsible department/unit

Department of Earth Sciences

Funding

  • Funding agency: Swedish Research Council
Topic and keywords

Research area

Earth and related environmental sciences (Standard för svensk indelning av forskningsämnen 2011)

Natural sciences (Standard för svensk indelning av forskningsämnen 2011)

Geoscientific information (INSPIRE topic categories)

Publications

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Beckel, R. A. and Juhlin, C.: The cross-dip correction as a tool to improve imaging of crooked-line seismic data: a case study from the post-glacial Burträsk fault, Sweden.
Accepted for publication in Solid Earth, Special Issue: Advances in seismic imaging across the scales, 2019.

Juhlin, C. and Lund, B.: Reflection seismic studies over the end-glacial Burträsk fault, Skellefteå, Sweden, Solid Earth, 2, 9–16, https://doi.org/10.5194/se-2-9-2011, 2011.
Link to article: Solid Earth

If you have published anything based on these data, please notify us with a reference to your publication(s). If you are responsible for the catalogue entry, you can update the metadata/data description in DORIS.

Published: 2019-04-17
Last updated: 2021-04-27