WFRF:(Carbonell J.)
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03834naa a2200397 4500 | |
| 001 | oai:DiVA.org:uu-96409 | |
| 003 | SwePub | |
| 008 | 071108s2007 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-964092 URI |
| 024 | 7 | a https://doi.org/10.1190/1.24072672 DOI |
| 040 | a (SwePub)uu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Schmelzbach, Cedricu Uppsala universitet,Geofysik4 aut |
| 245 | 1 0 | a Prestack and poststack migration of crooked-line seismic reflection data :b A case study from the South Portuguese Zone fold belt, southwestern Iberia |
| 264 | 1 | b Society of Exploration Geophysicists,c 2007 |
| 338 | a print2 rdacarrier | |
| 520 | a Crooked-line 2D seismic reflection survey geometries violate underlying assumptions of 2D imaging routines, affecting our ability to resolve the subsurface reliably. We compare three crooked-line imaging schemes involving prestack and poststack time migration using the 2D IBERSEIS deep seismic reflection profile running over the South Portuguese Zone thrust-and-fold belt to obtain crisp high-resolution images of the shallow crust. The crust is characterized by a complex subsurface geometry with conflicting dips of up to 50°. In summary, the three schemes are (1) normal-moveout (NMO) corrections, dip-moveout (DMO) corrections, common-midpoint (CMP) stacking, CMP projection, and poststack time migration; (2) NMO corrections, DMO corrections, CMP projection, zero-offset time migration of the common-offset gathers, and CMP stacking; (3) CMP projection, prestack time migration in the common-offset domain, and CMP stacking. An essential element of all three schemes is a CMP projection routine, projecting the CMPs first binned along individual segments for preprocessing onto one straight line, which is parallel to the general dip direction of the subsurface structures. After CMP projection, the data satisfy the straight-line assumption of 2D imaging routines more closely. We observe that the prestack time-migration scheme yields comparable or more coherent synthetic and field-data images than the other two DMO-based schemes along the parts of the profile where the acquisition overall follows a straight line. However, the schemes involving DMO corrections are less plagued by migration artifacts than the prestack time-migration scheme along profile parts where the acquisition line is crooked. In particular, prominent migration artifacts on the prestack migrated synthetic data can be related to significant variations in source-receiver azimuths for which 2D prestack migration cannot account. Thus, the processing scheme including DMO corrections, CMP projection, and zero-offset migration of common-offset gathers offers a reliable and effective alternative to prestack migration for crooked-line 2D seismic reflection processing. | |
| 650 | 7 | a NATURVETENSKAPx Geovetenskap och miljövetenskap0 (SwePub)1052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Earth and Related Environmental Sciences0 (SwePub)1052 hsv//eng |
| 653 | a Data acquisition | |
| 653 | a Earth crust | |
| 653 | a Imaging | |
| 653 | a Seismic waves | |
| 653 | a Seismology | |
| 653 | a Earth sciences | |
| 653 | a Geovetenskap | |
| 700 | 1 | a Juhlin, Christopheru Uppsala universitet,Institutionen för geovetenskaper4 aut0 (Swepub:uu)chrisjuh |
| 700 | 1 | a Carbonell, Ramon4 aut |
| 700 | 1 | a Simancas, J. Fernando4 aut |
| 710 | 2 | a Uppsala universitetb Geofysik4 org |
| 773 | 0 | t Geophysicsd : Society of Exploration Geophysicistsg 72:2, s. B9-B18q 72:2<B9-B18x 0016-8033x 1942-2156 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-96409 |
| 856 | 4 8 | u https://doi.org/10.1190/1.2407267 |
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