GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Aeromagnetic study of the Island of Hawaii
    American Geophysical Union (AGU) ; 1993
    In:  Journal of Geophysical Research: Solid Earth Vol. 98, No. B3 ( 1993-03-10), p. 4099-4119
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 98, No. B3 ( 1993-03-10), p. 4099-4119
    Abstract: An aeromagnetic study of the Island of Hawaii provides new insight on magnetic properties of subsurface rock and geologic structure. On a regional scale, spectral‐depth analysis delineates two shallow magnetic zones, each roughly 1.5 km thick, lying at a depth of 1 km. One zone (of unknown origin) lies in the center of the island and correlates with a regional magnetic high. The other zone coincides with pronounced magnetic lows paralleling Kilauea's active east rift zone. These magnetic lows probably depict rocks chemically altered by hydrothermal fluids, in which titanomagnetite has been destroyed. Analysis of magnetic terrain effects indicates that magnetization also decreases with depth within Mauna Kea and Mauna Loa. We estimate that magnetization is reduced by about half at a depth of 1 km. The magnetic method is particularly useful in delineating the lateral extent of local shield structures, such as rifts, summit calderas, pit craters, and vent fissures. Rifts possess characteristic magnetic patterns, primarily long‐wavelength linear magnetic low zones. We propose alteration processes reduce magnetizations along the flanks of rifts. On the other hand, along young rifts (e.g., Kilauea's east rift zone), short‐wavelength magnetic anomalies probably reflect slowly cooled, unaltered intrusions. Altered rock may also produce magnetic lows that help define buried summit calderas.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/92JB02483
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
    detail.hit.zdb_id: 161666-3
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    High-Resolution Aeromagnetic Study of the New Madrid Seismic Zone: A Preliminary Report
    Seismological Society of America (SSA) ; 1992
    In:  Seismological Research Letters Vol. 63, No. 3 ( 1992-07-01), p. 209-221
    Details
    In: Seismological Research Letters, Seismological Society of America (SSA), Vol. 63, No. 3 ( 1992-07-01), p. 209-221
    Abstract: A high-resolution aeromagnetic survey, flown over the northern part of the New Madrid seismic zone in the Mississippi embayment, reveals linear features that generally parallel active seismic zones. This parallelism suggests that the linear magnetic features are related to faults. Modeling of these anomalies indicates that the associated magnetic sources are shallow, steeply dipping ( 〉 80°) prism-like bodies. Their tops at depths of about 1 km are considerably shallower than the depth of crystalline basement (roughly 3 km). The bodies are typically 2 km wide. A plausible explanation for these bodies is that the magnetization within the sequence of generally nonmagnetic sedimentary rocks has been enhanced within and adjacent to fault zones. Such a magnetic enhancement could arise in several ways, including the emplacement of igneous intrusions, the authigenic growth of pyrrhotite, or the conversion of pyrite to magnetite. Whatever the cause of the magnetization contrast, the apparent relation between linear magnetic features and faults may lead to permissible stress models that accommodate the fault pattern inferred from the magnetic field.
    Type of Medium: Online Resource
    ISSN: 1938-2057 , 0895-0695
    URL: Article
    DOI: 10.1785/gssrl.63.3.209
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 1992
    detail.hit.zdb_id: 2403376-5
    detail.hit.zdb_id: 1147385-X
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Aeromagnetic survey over U.S. to advance geomagnetic research
    American Geophysical Union (AGU) ; 1996
    In:  Eos, Transactions American Geophysical Union Vol. 77, No. 28 ( 1996-07-09), p. 265-268
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 77, No. 28 ( 1996-07-09), p. 265-268
    Abstract: A proposed high‐altitude survey of the United States offers an exciting and cost effective opportunity to collect magnetic‐anomaly data. Lockheed Martin Missile and Space Company is considering funding a reimbursable ER‐2 aircraft (Figure 1) mission to collect synthetic aperture radar (SAR) imagery at an altitude of about 21 km over the conterminous United States and Alaska. The collection of total and vector magnetic field data would be a secondary objective of the flight. Through this “piggyback approach,” the geomagnetic community would inherit invaluable magnetic data at a nominal cost. These data would provide insight on fundamental tectonic and thermal processes and give a new view of the structural and lithologic framework of the crust and upper mantle.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/96EO00187
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
    detail.hit.zdb_id: 2118760-5
    detail.hit.zdb_id: 240154-X
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Unique U.S. magnetic anomaly data base forthcoming
    American Geophysical Union (AGU) ; 2002
    In:  Eos, Transactions American Geophysical Union Vol. 83, No. 49 ( 2002-12-03), p. 576-576
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 83, No. 49 ( 2002-12-03), p. 576-576
    Abstract: The year 2004 will offer an exciting and cost‐effective opportunity to acquire a new U.S. magnetic anomaly data base. High Altitude Mapping Missions Inc. (HAMM) is currently planning an airborne mission to collect high‐resolution Interferometric Synthetic Aperture Radar (IFSAR) imagery at an altitude of about 15 km, with a flight‐line spacing of about 14 km over the conterminous United States and Alaska. Total and vector magnetic field data will also be collected with a “piggy‐back” magnetometer system as a secondary mission objective. Because HAMM would fund the main flight costs of the mission, the geomagnetic community would acquire invaluable magnetic data at a nominal cost. These unique data will provide new insights on fundamental tectonic and thermal processes and give a new view of the structural and lithologic framework of continental areas and offshore regions.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2002EO000397
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
    detail.hit.zdb_id: 2118760-5
    detail.hit.zdb_id: 240154-X
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Upgraded gravity anomaly base of the United States
    Society of Exploration Geophysicists ; 2002
    In:  The Leading Edge Vol. 21, No. 4 ( 2002-04), p. 366-387
    Details
    In: The Leading Edge, Society of Exploration Geophysicists, Vol. 21, No. 4 ( 2002-04), p. 366-387
    Type of Medium: Online Resource
    ISSN: 1070-485X , 1938-3789
    URL: Article
    DOI: 10.1190/1.1471598
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 2002
    detail.hit.zdb_id: 1221792-X
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Geophysical constraints on understanding the origin of the Illinois basin and its underlying crust
    Elsevier BV ; 2003
    In:  Tectonophysics Vol. 363, No. 1-2 ( 2003-2), p. 45-78
    Details
    In: Tectonophysics, Elsevier BV, Vol. 363, No. 1-2 ( 2003-2), p. 45-78
    Type of Medium: Online Resource
    ISSN: 0040-1951
    URL: Article
    DOI: 10.1016/S0040-1951(02)00653-4
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2003
    detail.hit.zdb_id: 204243-5
    SSG: 16,13
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    A source-depth separation filter: Using the Euler method on the derivatives of total intensity magnetic anomaly data
    Society of Exploration Geophysicists ; 2002
    In:  The Leading Edge Vol. 21, No. 4 ( 2002-04), p. 360-365
    Details
    In: The Leading Edge, Society of Exploration Geophysicists, Vol. 21, No. 4 ( 2002-04), p. 360-365
    Type of Medium: Online Resource
    ISSN: 1070-485X , 1938-3789
    URL: Article
    DOI: 10.1190/1.1471597
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 2002
    detail.hit.zdb_id: 1221792-X
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    The Utility of Geopotential Field Data in Seismotectonic Studies in the Eastern United States
    Seismological Society of America (SSA) ; 1988
    In:  Seismological Research Letters Vol. 59, No. 4 ( 1988-10-01), p. 289-297
    Details
    In: Seismological Research Letters, Seismological Society of America (SSA), Vol. 59, No. 4 ( 1988-10-01), p. 289-297
    Abstract: The deterministic approach to seismic hazard evaluation utilizes all available geologic/geophysical information to map the structure and nature of the crust in three dimensions that may relate to earthquake activity. However, information on the crystalline crust of the eastern United States from direct observations, drilling and sparse crustal seismic studies is limited. In contrast, regional gravity and magnetic anomaly data exist over the entire eastern United States and are available in a digital grid to facilitate processing and analysis. Although these data have serious limitations for detailed interpretation, they can be used to estimate the strength of the crust and the lithosphere and to map and characterize (1) zones of weakness such as paleorifts, sutures, and faults; (2) regions of potential stress amplifications such as plutons and irregularities in fault zones; and (3) basement terranes of generally consistent structural pattern that may delimit coherent regional seismic zones. Free-air, Bouguer, and isostatic gravity anomalies have different applications in the characterization of the crust for seismogenic purposes and complement magnetic anomaly maps which focus on upper crustal features. In concert, these data have provided the insight to interpret the host structures that together with related seismic and geoscience data, suggest causative mechanisms of the New Madrid seismic zone and other seismogenic regions of the eastern United States. As a result, we conclude that interpretations of geopotential anomalies are an essential ingredient in seismotectonic studies in the eastern United States, but they are only one of several tools required in the concerted effort of assessing seismic hazards. The presence of anomalies with a particular set of attributes neither confirms nor denies the possible spatial relationship to seismicity.
    Type of Medium: Online Resource
    ISSN: 1938-2057 , 0895-0695
    URL: Article
    DOI: 10.1785/gssrl.59.4.289
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 1988
    detail.hit.zdb_id: 2403376-5
    detail.hit.zdb_id: 1147385-X
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Rift Structure of the Northern Mississippi Embayment from the analysis of gravity and magnetic data
    American Geophysical Union (AGU) ; 1985
    In:  Journal of Geophysical Research: Solid Earth Vol. 90, No. B14 ( 1985-12-10), p. 12607-12622
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 90, No. B14 ( 1985-12-10), p. 12607-12622
    Abstract: Gravity and magnetic data have been simultaneously inverted to derive a crustal model of the northern Mississippi Embayment which is compatible with geologic and seismic refraction data. The results indicate that this region is a site of a late Precambrian‐early Paleozoic rift system. An anomalously dense layer is present at the base of the crust and thickens beneath a broad northeast trending graben that formed during the initial phases of rifting. The thickest part of anomalous crust occurs beneath the region of greatest seismic activity, which lies within the geographic limits of the graben. It is suggested from this correlation that strain accumulates within the anomalous crust layer, which acts as an inhomogeneity in a relatively homogeneous lithosphere. Based on the results of this study and previous geophysical studies, the complex tectonic evolution of the upper Mississippi Embayment since late Precambrian time is rift formation possibly along a pre‐existing shear zone, graben development in Cambrian time, reactivations in Permian and Cretaceous time, and subsequent formation of the present Mississippi Embayment and fault zones with large influences from rift structures.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB090iB14p12607
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1985
    detail.hit.zdb_id: 161666-3
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    Quantitative investigations of the Missouri gravity low: A possible expression of a large, Late Precambrian batholith intersecting the New Madrid seismic zone
    American Geophysical Union (AGU) ; 1996
    In:  Journal of Geophysical Research: Solid Earth Vol. 101, No. B10 ( 1996-10-10), p. 21921-21942
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 101, No. B10 ( 1996-10-10), p. 21921-21942
    Abstract: Analysis of gravity and magnetic anomaly data helps characterize the geometry and physical properties of the source of the Missouri gravity low, an important cratonic feature of substantial width (about 125 km) and length ( 〉 600 km). Filtered anomaly maps show that this prominent feature extends NW from the Reelfoot rift to the Midcontinent Rift System. Geologic reasoning and the simultaneous inversion of the gravity and magnetic data lead to an interpretation that the gravity anomaly reflects an upper crustal, 11‐km‐thick batholith with either near vertical or outward dipping boundaries. Considering the modeled characteristics of the batholith, structural fabric of Missouri, and relations of the batholith with plutons and regions of alteration, a tectonic model for the formation of the batholith is proposed. The model includes a mantle plume that heated the crust during Late Precambrian and melted portions of lower and middle crust, from which the low‐density granitic rocks forming the batholith were partly derived. The batholith, called the Missouri batholith, may be currently related to the release of seismic energy in the New Madrid seismic zone (earthquake concentrations occur at the intersection of the Missouri batholith and the New Madrid seismic zone). Three qualitative mechanical models are suggested to explain this relationship with seismicity.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/96JB01908
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
    detail.hit.zdb_id: 161666-3
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...