Relationship between seismic velocity and heat production: comparison of two sets of data and test of validity

Čermák, Vladimír; Bodri, L.; Rybach, Ladislaus; Buntebarth, Günter

doi:10.1016/0012-821x(90)90069-a

Cited by 50 publications

(17 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For sediment layer 1 and layer 4 we test values of 0.5, 1.0 and 1.5 μ W m −1 (Table 1) which are consistent with the range of values selected for most previous thermal studies [ Dumitru , 1991; Hyndman and Wang , 1993; Oleskevich et al , 1999]. Mafic to ultramafic rocks are known for their low composition in radioactive isotopes and thus for their low heat generation: around 0.11 ± 0.13 μ W m −3 for gabbros and 0.01 ± 0.01 μ W m −3 for basalts [ Brown and Mussett , 1993; Cermak et al , 1990]. In our study, we use values of 0.01, 0.05 and 0.1 μ W m −3 to test the influence of the heat generation of the layer 2 on the thermal regime (Table 1).…”

Section: Thermal Modelingsupporting

confidence: 87%

Thermal regime from bottom simulating reflectors along the north Ecuador–south Colombia margin: Relation to margin segmentation and great subduction earthquakes

et al. 2006

View full text Add to dashboard Cite

[1] The north Ecuador-south Colombia (NESC) margin has three transverse morphotectonic segments (the Manglares, Tumaco, and Patia segments), each with different tectonic and structural patterns. Following the 1906 subduction earthquake, the NESC margin has been the site of three megathrust events in 1942, 1958, and 1979 for which the rupture zones abut one another. We first investigated variations in heat flow derived from bottom simulating reflectors (BSR) observed along multichannel seismic lines sampling the three morphotectonic segments. Strong along-strike variations of the BSR-derived heat flow, just landward of the deformation front, suggest that each morphotectonic segment has a specific thermal regime. Finite element thermal models show that these variations are mainly produced by changes in the age and the dip of the oceanic plate and local hydrothermal cooling. We then examined the relationship between seismogenesis and thermal structure along the plate boundary. The updip limits of the 1942 and 1979 seismogenic zones, estimated from the aftershock area and rupture zone, reach the trench, where the temperature at the top of the subducting plate appears to be 50°-60°C. Between these events the seismogenic zone of the 1958 earthquake is restricted to a region landward of a prominent outer basement high where the temperature appears to be 100°-120°C. We propose that on the NESC margin the updip limit of the seismogenic zone is primarily controlled by low-temperature processes except for the 1958 event for which the seismogenic updip limit appears to be related to a structural feature in the upper plate.

show abstract

Section: Thermal Modelingsupporting

confidence: 87%

Thermal regime from bottom simulating reflectors along the north Ecuador–south Colombia margin: Relation to margin segmentation and great subduction earthquakes

et al. 2006

View full text Add to dashboard Cite

show abstract

“…The lower crystalline basement (>20 km) was assigned a constant heat generation of 0.1 µW m 3 ; ß was 5.5 between km 140 and 320. In Scenario C crystalline basement heat generation was derived using the V p -heat generation relationship from Cermak et al (1990) and seismic velocities for the area from Skogseid et al (1992). The rationale for using different scenarios of heat generation is that with increasing Table 1.…”

Section: Endogenic Causes Of Heat Flow Variationmentioning

confidence: 99%

Heat flow in the Vøring Basin, Mid-Norwegian Shelf

Ritter

Zielinski²,

Weiss

et al. 2004

View full text Add to dashboard Cite

In situ temperature and heat flow were determined in 1994 at 159 sites, grouped into 66 clusters between latitude 65 N and 67 30' N at water depths from 669 m to 1464 m. The mean of all cluster heat-flow measurements conducted in this survey was 58.5 mW m 2 , with a standard error of 4.40 mW m 2 . The mean heat flow from IKU well data for the Trøndelag Platform is 56.2 6.65 mW m 2 . Shorter wavelength heat-flow variations appear to be controlled structurally and can be explained by sedimentation and thermal refraction effects. High heat flow associated with faulted structural highs such as the Nyk High and Vema Dome-Rym Fault Zone may also result from hydrothermal convection. Relatively isolated high (106.6 mW m 2 ) heat flow observed at 846 m water depth may be an artefact of bottom water disturbances; however, virtually identical deep-water heat-flow anomalies, believed to be of hydrothermal origin, also exist. While heat-flow measurements made at water depths less than 1000 m should be regarded with caution, there is presently no justification for eliminating those exhibiting linear heat flow with depth. Submarine avalanches seem unimportant in the survey area. Neither crustal thinning, underplating nor sill intrusion, within the last 50 Ma, would have a measurable effect on present-day heat flow. The net effect of crustal thinning may be a reduction of the crustal heat generation potential, depending on the degree of thinning of the upper crust, since the accumulating sediments cannot compensate fully for the lost heat generation from a crystalline basement.

show abstract

“…Deeper horizons were characterized by generalized data and correlative relationships between thermal parameters and seismic velocities [Rybach, Buntebarth, 1982;Kutas et al, 1989;Čermak et al, 1990;Rybach, 1996].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous structure of the lithosphere in the Black Sea from a multidisciplinary analysis of geophysical fields

Rusakov

Pashkevich

Кутас

et al. 2017

Geofizicheskiy Zhurnal

View full text Add to dashboard Cite

Magnetic, gravity, geothermal, seismic and tomographic data from the lithosphere were first jointly examined. A multidisciplinary interpretation has resulted in a new and consistent model for lithospheric density, magnetic, thermal and velocity heterogeneities. Faults of different orders for the crystalline crust have been mapped in details. Large deep fault zones were recognized. Among them is the most prominent Odessa-Sinop-Ordu (OSO) fault zone, which played a key role in the opening and development of the Black Sea Depression. A fundamental difference was revealed between the crustal and mantle structure and geophysical parameters of the Western Black Sea Basin (WBSB) and Eastern Black Sea Basin (EBSB). These dissimilarities are in the size of «non-granitic» crust, pattern and intensity of heat flow, topography of the lower boundary of the thermal lithosphere, mantle seismic velocity and structure of magnetic and residual gravity anomalies. Based on new information it was demonstrated that the WBSB and EBSB were diachronously formed on two large distinct continental blocks with independent post-rift development of the sub-basins. The rifting of the western sub-basin commenced earlier than that of the eastern one. The EBSB is characterized by younger thermal activity than the WBSB and consequently it was stabilized later. The Mid Black Sea High (MBSH) is not a single tectonic unit but is formed by two ridges of various crystalline crustal structure and age shifted relative to each other by the faults of the OSO zone.Key words: The Black Sea basins, magnetics, gravity, heat flow, fault tectonics, seismic tomography, lithosphere heterogeneity.Впервые проведен общий анализ магнитных, гравитационных, геотермических, сейсми-ческих и томографических данных о литосфере Черного моря. В результате комплексной интерпретации получена новая и согласованная модель плотностной, магнитной, термаль-ной и сейсмической неоднородностей литосферы. Построена подробная карта разломов консолидированной коры разных рангов. Выявлены зоны глубинных разломов. Среди них наиболее примечательна зона разлома Одесса-Синоп-Орду, игравшая ключевую роль в рас-крытии и развитии Черноморской впадины. Выявлены фундаментальніе различия в строе-нии и геофизических параметрах коры и литосферы Западно-и Восточно-Черноморской впадин. Эти различия заключаются в размере площади «безгранитной» коры, структуре и интенсивности теплового потока, топографии нижней границы термальной литосферы, осо-бенностях магнитного и остаточного гравитационного полей. На основе новой информации показано, что Западно-и Восточно-Черноморская впадины сформировались в разное время на двух различных крупных блоках континентальной коры с независимым пострифтовым развитием суббассейнов. Рифт в западном бассейне образовался раньше, чем в восточном. Восточно-Черноморская впадина отличается более молодой термической активностью, чем Западно-Черноморская, которая стабилизировалась позже. Центрально-Черноморское под-нятие не представляет собой единую тектоническую единицу, а сформиро...

show abstract

Relationship between seismic velocity and heat production: comparison of two sets of data and test of validity

Cited by 50 publications

References 18 publications

Thermal regime from bottom simulating reflectors along the north Ecuador–south Colombia margin: Relation to margin segmentation and great subduction earthquakes

Thermal regime from bottom simulating reflectors along the north Ecuador–south Colombia margin: Relation to margin segmentation and great subduction earthquakes

Heat flow in the Vøring Basin, Mid-Norwegian Shelf

Heterogeneous structure of the lithosphere in the Black Sea from a multidisciplinary analysis of geophysical fields

Contact Info

Product

Resources

About