Reflection seismic study of the Siljan Ring impact structure: Orsa - Stacked data

DOI

Two new reflection seismic profiles over the Paleozoic successions of the western part of the Siljan Ring impact structure were acquired during 2011, the Mora and the Orsa profile. This data set concerns the Orsa profile. The profile has length of c. 12 km and the processed data image the geological section to about 3 km depth (Silurian siliciclastic and Ordovician carbonate rocks to serveral hundred metres depth, below disturbed Paleoproterozoic crystalline basement). During the survey, 542 source points (VIBSIST 3000) were recorded by 320 receiver channels for 30 seconds. From this recording, the following data sets were generated and are published here: 1) decoded and quality controlled raw data; 2) pre-processed (shot geometry applied) data; 3) stacked data; 4) migrated data; 5) depth converted data and velocity field. Key acquisition parameters are: Number of channels: 320 (160–160) Near offset: 0m Geophone spacing: 10 m Geophone type: 28 Hz single Source spacing: 20 m Source type: VIBSIST 3000 Hit interval between hammer blows: 100–200 ms Sweeps per source point: 3–4 Nominal fold: 80 Recording instrument: SERCEL 428UL Sample rate: 1 ms Field low cut: Out Field high cut: 400 Hz Record length: 30 s Profile length: 12 km Source points: 542 Dates acquired: 10/6–15/6: 2011 This dataset contains processed data of the Orsa profile. 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: Spherical divergence correction 6: Trace editing 7: Trace balance: 0–3000 ms 8: Spectral equalization: 0–600 ms: 50–80–200–240 Hz; 700–1500 ms: 40–70–180–240 Hz 9: Time variant bandpass filter: 0–400 ms: 50–80–240–360 Hz; 450–600 ms: 45–70–210–300 Hz; 700–1000 ms: 40–60–180–270 Hz; 1100–3000 ms: 35–50–150–225 Hz 10: Refraction statics: datum 180 m, replacement velocity 3000 m/s 11: Residual statics 12: Median filter: 11 traces, 3 samples, 1600, 2000, 2400 m/s, subtract 13: AGC: 50 ms 14: No mute 15: Residual statics 16: Velocity analysis 17: NMO correction: 70% stretch mute 18: Trace balance 19: FX Decon: 19 trace window 20: Dip filter 1.5 ms/trace cutoff 21: Trace balance Processed seismic data stored as one file for the enitre seismic profile, according to SEG technical standard SEG-Y revision 1 (SEG-Y_r1.0, 2002); https://seg.org/Publications/SEG-Technical-Standards

År 2011 gjordes två nya reflexionsseismiska undersökningar över västra delen av Siljansringen, Mora och Orsa profilerna. Siljansringen är en struktur som uppkom för ca 377 miljoner sedan genom ett meteoritnedslag. Orsa profilen (detta dataset) är ca 12 km lång och visar de geologiska strukturerna till ca 3 km djup. Geologin består av flera hundra meter med siluriska klastiska sedimentära bergarter och ordoviciska karbonatbergarter som vilar på paleoproterozoiskt kristallint urberg. En mer detaljerad beskrivning av datasetet som inkluderar alla viktiga parametrar är tillgängligt på den engelska katalogsidan: https://snd.gu.se/en/catalogue/study/SND1042. Bearbetad data för Orsa-profilen. Mer information på den engelska katalogsidan: https://snd.gu.se/en/catalogue/study/SND1042

Identifier
DOI https://doi.org/10.5878/002986
Metadata Access https://datacatalogue.cessda.eu/oai-pmh/v0/oai?verb=GetRecord&metadataPrefix=oai_ddi25&identifier=5f8adec7ad1d5077fd2e109c924cfea62c4901a0e6a2fe8c70b52d54a1f0f866
Provenance
Creator Juhlin, Christopher; Sturkell, Erik; Ebbestad, Jan Ove R.; Lehnert, Oliver; Högström, Anette E. S.; Meinhold, Guido
Publisher Swedish National Data Service; Svensk nationell datatjänst
Publication Year 2018
Rights Access to data through SND. Data are freely accessible.; Åtkomst till data via SND. Data är fritt tillgängliga.
OpenAccess true
Contact https://snd.gu.se
Representation
Discipline Natural Sciences
Spatial Coverage Sweden; Sverige