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Journal Publications:



Rock Magnetism & Earth Magnetic Field:

Rock Magnetism & Earth Magnetic Field:

 

Wehland F., Stancu A., Rochette P., Dekkers M., Appel E., 2005: Experimental evaluation of magnetic interaction in pyrrhotite bearing samples. Phys. Earth Planet. Inter., 153(4), 181-190.

 

Wehland F., Leonhardt R., Vadeboin F., Appel E., 2005: Magnetic interaction analysis of basaltic samples and pre-selection for absolute paleointensity measurements. Phys. Earth Planet. Inter., 162, 1-6.

 

Wehland F., Eibl O., Braun S., Alt-Epping U., Appel E., 2005: Pyrrhotite pTRM acquisition in metamorphic limestones in the light of microscopic observations. Phys. Earth Planet. Inter., 151, 107-114.

 

Wehland F., Alt-Epping U., Braun S., Appel E., 2005: Quality of pTRM acquisition in pyrrhotite bearing contact-metamorphic limestones: Possibility of a continuous record of Earth magnetic field variations. Phys. Earth Planet. Inter., 148, 157-173.

 

Hu S., Stephenson A., Appel E., 2002: A study of gyroremanent magnetisation (GRM) and rotational remanence magnetisation (RRM) carried by greigite from lake sediments. Geophys. J. Int., 151, 468-474.

 

Hu S., Appel E., Hoffmann V., Schmahl W., 2002: Identification of greigite in lake sediments and its magnetic significance. Science in China., D45(1), 81-87.

 

Schill E., Appel E., Gautam P., 2002: Towards pyrrhotite/magnetite geothermometry in low-grade metamorphic carbonates of the Tethyan Himalayas (Shiar Khola, central Nepal). J. Asian Earth Sci., 20, 195-201.

 

Hu S., Appel E., Hoffmann V., Schmahl W., Wang S., 1998: Gyromagnetic remanence acqired by greigite (Fe3S4) during static three-axis AF demagnetization. Geophys. J. Int., 134, 831-842.

 

Hu S., Wang S., Appel E., 1998: Remanence acquisition and alteration in lake sediments. Chinese Sci. Bull., 43(17), 1421-1434.

 

Hoffmann V., Soffel H.C., Appel E., 1990: Quantitative magneto-optical Kerr-effect on titano-magnetites. Phys. Earth Planet. Inter., 65, 28-35.

 

Appel E., Hoffmann, Soffel H.C., 1990: Magneto-optical Kerr-effect in (titano)magnetite, pyrrhotite and hematite. Phys. Earth Planet. Inter., 65, 36-42.

 

Soffel H.C., AumĂŒller C., Hoffmann V., Appel E., 1990: Three-dimensional domain observations of magnetite and titanomagnetites usin dried colloid SEM method. Phys. Earth Planet. Inter., 65, 43-53.

 

Appel E., 1987: Stress anisotropy in Ti-rich titanomagnetites. Phys. Earth Planet. Inter., 46, 233-240.

 

Hoffmann V., SchÀfer R., Appel E., Hubert A., Soffel H.C., 1987: First domain observations with the magneto-opical Kerr effect on Ti-rich Ti-ferrites in rocks and their synthetic equivalents. J. Magn. Magn. Mat., 71, 90-94.

 

Appel E., Soffel H.C., 1985: Domain state of Ti-rich titanomagnetites deduced from domain structure observations and susceptibility measurements. J. Geophys., 56, 121-132.

 

Appel E., Soffel H.C., 1984: Model for the domain state of Ti-rich titanomagnetites. Geophys. Res. Lett., 3, 189-192.

 

Soffel H.C., Appel E., 1982: Domain structure of small synthetic titanomagnetite particles and experiments with IRM and TRM. Phys. Earth Planet. Inter., 30, 348-355.

 

Soffel H.C., Deutsch E., Appel E., Eisenach P., Petersen N., 1982: The domain structure of stoichiometric TM10-TM75 and Al-, Mg-, Mn- and V-doped TM62 titanomagnetites. Phys. Earth Planet. Inter., 30, 336-346.



 

Environmental Magnetism & Magnetostratigraphy:

Duan X., Hu S., Yan H., Blaha U., Rösler W., Appel E., Sun W. in press: Relationship between magnetic parameters and heavy element contents of arable soil around Meishan steel mill, Nanjing. Science in China .

Gautam P., Blaha U., Appel E. 2008: Assessment of vehicular pollution in Kathmandu: magnetic properties and heavy metal chemistry of dust from streets and leav. J. Nepal Geol. Soc. 37, 67-76.

Blaha U., Sapkota B., Appel E., Stanjek H. 2008: Micro-scale grain-size analysis and magnetic properties of coal-fired power plant fly ash and its relevance for environmental magnetic pollution studies. Atmospheric Environment. 42(36), 8359-8370.

Hu S., Duan X., Shen M., Blaha U., Rösler W., Yan H., Appel E., Hoffmann V. 2008: Magnetic response to atmospheric heavy metal pollution recorded by dust-loaded leaves in Shougang industrial area, western Beijing. Chinese Sci. Bull. 53(10), 1555-1564.

Blaha U., Appel E., Stanjek H. 2008: Determination of anthropogenic boundary depth in soil profiles and semi-quantification of heavy metal loads using magnetic susceptibility. Environmental Pollution. 156(2), 278-289.

Hu S., Goddu S.R., Appel E., Verosub K., Yang X., Wang S. 2007: Fine-tuning of age integrating magnetostratigraphy, radiocarbon dating and carbonate cyclicity: example of lacustrine sediments from Heqing basin (Yunnan, China) covering the past 1 Myr. J. Asian Earth Sci., 30, 423-432.

Goddu S.R., Appel E., Gautam P., Oches R., Wehland F. 2007: The lacustrine section at Lukundol, Kathmandu Basin, Nepal: Dating and magnetic fabric aspects. J. Asian Earth Sci., 30(1), 73-81.

Yan H., Hu S., Appel E., Hoffmann V., Zhu Y.,2006: The magnetic response towards the vertical migration of burned coal ash in soil profile. Chinese J. Geophys., 48(6), 1462-1469.

Fabiola H., Maier G., Petrovsky E., Kapicka A., Boyko T., Scholger R., MAGPROX-Team (Appel E. is a member). 2006: Magnetic properties of soils from sites with different geological and environmental settings. J. Appl. Geophys. 59, 273-283.

Magiera T., Stzyszcz, Kapicka A., Petrovsky E., MAGPROX-Team (Appel E. is a member), 2006: Discrimination of lithogenic and anthropogenic influences on topsoil magnetic susceptibility in Europe. Geoderma.,130, 299-311.

Spiteri C., Kalinski V., Rösler W., Hoffmann V., Appel E. and MAGPROX-Team, 2005: Magnetic screening of a pollution hotspot in the Lausitz area, eastern Germany: correlation analysis between magnetic proxies and heavy metal pollution. Environm. Geol., 49, 1-9.

Knab M., Hoffmann V., PetrovskĂœ E., Kapicka A., Jordanova N., Appel E., 2005: Surveying Moldau River by Using Magnetic Susceptibility. Environm. Geol., 49, 527-535.

Wang Y., Hu S., Zhu Y., Yin Y., Zhou W., Appel E., Hoffmann V., 2005: The lacustrine sedimentary records of coal-burning atmospheric pollution. Science in China, D48(10), 1740-1746.

Gautam P., Blaha U., Appel E., 2005: Integration of magnetism and heavy metal chemistry of soils to quantify the environmental pollution in Kathmandu, Nepal. Island Arc, 14, 424-435.

Hu S., Goddu, S.R., Appel E., Verosub K., Yang X., Wang S., 2005: Palaeoclimatic changes over the past one million years derived from lacustrine sediments of Heqing basin (Yunnan, China). In A. Prokopenko, N. Catto (edts.): Paleolimnological records from Asian lacustrine systems: archives of large scale seasonal atmospheric circulation changes in the northern hemisphere. Quarternary Int. 136(1), 123-129.

Pant R.K., Basavaiah N., Juyal N., Saini N.K., Yadava M.G., Appel E., Singhvi A.K., 2005: A 20 ka climate record from central Himalayan loess deposits. Journal Quart. Sci., 20(0), 1-8.

Gautam P., Blaha U., Appel E., 2005: Magnetic susceptibility of dust loaded leaves as a proxy of traffic related heavy metal pollution in Kathmandu city, Nepal. Atmosph. Environm., 39, 2201-2211.

Magiera T., Appel E., Barcelo D., Buchter B., Czaplicka M., Grathwohl P., Halm D., Hoffmann V., Matile L., Schulin R., S.R., Rösler W., 2005: Screening and monitoring tools at different scales. In: Integrated soil and water protection, risks from diffuse pollution, research needs defined by SOWA (edts.: Halm D. & Grathwohl P.) http://www.uni-tuebingen.de/sowa, 29-38.

Halm D., Grathwohl P., Gocht T., Appel E., BarcelĂł D., Hoffmann V., Jauzein M., Jones K., Magiera T., Rösler W., Schulin R., Totsche K.U., Walther W., Vogel T., van der Zee S., 2005: Integrierter GewĂ€sserschutz in Europa - zukĂŒnftiger Forschungsbedarf bei diffusen Schadstoffbelastungen. Bodenschutz ("Soil Protection"), 4, 105-109.

Gautam P., Blaha U., Appel E., Neupane G., 2004: Environmental magnetic approach towards the quantification of pollution in Kathmandu urban area, Nepal. Phys. Chem. Earth, 29, 973-984.

Goddu S.R., Appel E., Jordanova D., Wehland F., 2004: Magnetic properties of road dust from Visakhapatnam (India) - relationship to industrial pollution and road traffic. Phys. Chem. Earth., 29, 985-995.

Basavaiah N., Juyal N., Pant R.K., Yadava M.G., Singhvi A.K., Appel E., 2004: Late Quarternary climate changes reconstructed from mineral magnetic studies from proglacial lacustrine deposits of Higher Central Himalaya. J. Indian Geophys. Union, special issue, 8(1) 27-37, ISSN 0971-9707, Hyderabad.

Wehland F., Panaiotu C., Appel E., Hoffmann V., Jordanova D., Jordanova N., 2003: The dam breakage of Baia Mare - a pilot study of magnetic screening. Phys. Chem. Earth, 27, 1371-1376.

Phartiyal B., Appel E., Blaha U., Hoffmann V., Kotlia B.S., 2003: Palaeoclimatic significance of magnetic properties from Late Quarternary lacustrine sediments at Pithoragarh, Kumaun Lesser Himalaya, India. J. Quarternary Int., 108/1, 51-62.

Hu S., Wang Y., Appel E., Zhu Y., Hoffmann V., Shi C., Yu Y. 2003: Magnetic responses to acidification in Lake Yangzonghai, SW China. Phys. Chem. Earth., 28, 711-717

Appel E., Hoffmann V., Rösler W., Schibler L., 2003: Magnetic proxy mapping as a tool for outlining contaminated areas. 2nd Int. GRACOS/SOWA Workshop, TĂŒbingen (20./21.3.2003). TĂŒbinger Geowiss. Arb. (TGA), C69, 260p., http://w210.ub.uni-tuebingen.de/dbt/volltexte/2003/794/.

Hu S., Deng C., Appel E., Verosub K., 2002: Environmental magnetic studies of lacustrine sediments. Chinese Science Bulletin, 47(7), 613-616.

Schibler L., Boyko T., Ferdy M., Höll S., Jordanova N., Rösler W., MAGPROX-Team (Appel E. is a member of...), 2002: Topsoil magnetic susceptibility mapping: data reproducibility and compatibility, measurement strategy. Stud. Geophys. Geod., 46, 43-57.

Knab M., Appel E., Hoffmann V., 2001: Separation of the anthropogenic portion of heavy metal contents along a highway by means of magnetic susceptibility and fuzzy c-means cluster analysis. European J. Environm. Engin. Geophysics, 6, 125-140.

Koessler P., Erbacher J., Appel E., 2001: Magnetic records of climatic cycles from Mid-Cretaceous hemipelagic sediments of the Vocontian basin (SE France). Cretaceous Res., 22, 321-331.

Terhorst B., Appel E., Werner A., 2001: Palaeopedological and magnetic susceptibility of a Loess-Palaeosol sequence in South West Germany. Quaternary Int., 76-77, 231-240.

Junghans W.-D., Rösler W., Aigner T., Appel E., 2001: Magnetostratigraphie an der Perm/Trias-Grenze der Bohrung Kraichgau 1002 (SW-Deutschland). N. Jb. Geol. PalÀont. Mh.

Hu S., Wang S., Appel E., Ji L., 2000: Environmental mechanism of magnetic susceptibility changes of lacustrine sediments form Lake Hulun, China. Science in China, 28(4), 334-339.

Hoffmann V., Knab M., Appel E., 1999: Magnetic Susceptibility Mapping of Roadside Pollution. J. Geochem. Expl., 66, 313-326.

Wang S., Hu S., Appel E., Ma X., Hoffmann V., Sun Z., Yang X.D., Ma Y., Pan H., 1999: Incursion of sea water into Gucheng Lake detected by magnetic, biologic and chemical data. Phys. Chem. Earth. A, 24 (9), 805-809.

Hu S., Appel E., Wang S., 1999: A magnetic study on lacustrine sediments from Zoige basin, eastern Tibetan Plateau, China: Magnetostratigraphy and environmental implications. Phys. Chem. Earth. A, 24 (9), 811-816.

Mayer H., Appel E., 1999: Milankovitch cyclicity and rock-magnetic signatures of palaeoclimatic chnage in the Early Cretaceous Biancone Formation of the southern Alps (Italy). Cretaceous Res., 20, 189-214.

Rösler W., Appel E:, 1998: Fidelity and time resolution of the magnetostratigraphic record in Siwalik sediments: High resolution study of a complete polarity transition and evidence for cryptochrons in a Miocene fluviatile section. Geophys. J. Int., 135, 861-875.

Appel E., Rösler W., Corvinus G., 1994: Magnetic polarity stratigraphy of the Neogene Surai Khola section. In Kumar R., Ghosh S.K., Phadtare N.R. (edts.): Siwalik Foreland Basin of Himalaya. Himalayan Geol., 15, 63-68.

Gautam P., Appel E., 1994: Magnetic polarity stratigraphy of Siwalik group sediments of Tinau Khola section in west central Nepal, revisited. Geophys. J. Int., 117, 224-234.

Rösler W., Metzler W., Appel E: 1997: Neogene magnetic polarity stratigraphy of some Siwalik sections, Nepal. Geophys. J. Int., 130, 89-111.

Appel E., Rösler W., Corvinus G., 1991: Magnetostratigraphy of the Miocene-Pleistocene Surai Khola Siwaliks in West-Nepal. Geophys. J. Int., 105, 191-198.

Appel E., Rösler W., Faßbinder J., Corvinus G., 1989: Magnetostratigraphy of the Neogene Surai Khola Siwaliks in West-Nepal: preliminary results. QuartĂ€r, 39/40, 125-130.



Palaeomagnetism & Geodynamics:

Waldhör M., Appel E. 2009: Layer parallelization: an unrecognized mechanism of tectonic rotation in fold belts. Tectonophysics. doi:10.1016/j.tecto.2009.04.028.

Crouzet C., Dunkl I., Paudel L., Árkai P., Rainer T.M., Balogh K., Appel E., 2007: Temperature and age constraints on the metamorphism of Tethyan Himalaya in Central Nepal: a multidisciplinary approach. J. Asian Earth Sci. 30, 113-130

Waldhoer M., Appel E., 2006: Intersections of remanence small circles: new tools to improve data processing and interpretation in palaeomagnetism. Geophys. J. Int., 166, 33-45.

Schill E., Appel E., Crouzet C., Gautam P., Wehland F., Staiger M., 2004: Oroclinal bending versus regional significant clockwise rotations in the Himalayan arc - constraints from secondary pyrrhotite remanences. In: Sussman A.J. and Weil A.B., Orogenic curvature: Integrating paleomagnetic and structural analyes. Geol. Soc. Am. Special Paper 383, 73-85.

Crouzet C., Gautam P., Schill E., Appel E., 2003: Multicomponent magnetization in Western Dolpo (Tethyan Himalaya, Nepal): implications for tectonic motions. Tectonophysics, 377(1-2), 179-196.

Schill E., Appel E., Godin L., Crouzet C., Gautam P., Regmi K.R., 2003: Record of deformations by secondary magnetic remanences and magnetic anisotropy in the Nar/Phu valley (central Nepal). Tectonophysics, 377(1-2), 197-209.

Schill E., Crouzet C., Gautam P., Singh V.K., Appel E., 2002: Where did rotational shortening occur in the Himalayas? - Inferences from palaeomagnetic analyses of remagnetisations. Earth Planet. Sci. Lett., 203(1), 45-57.

Schill E., Appel E., Gautam P., Dietrich P., 2002: Thermo-tectonic history of the Tethyan Himalayas deduced from palaeomagnetic record of metacarbonates from Shiar Khola (central Nepal). J. Asian Earth Sci., 20, 203-210.

Schill E., Appel E., Zeh O., Singh V.K., Gautam P., 2001: Coupling of late-orogenic tectonics and secondary pyrrhotite remanences: towards a separation of different rotation processes and quantification of rotational underthrusting in the western Himalayas (N-India). Tectonophysics, 337/1-2, 1-21.

Crouzet C., Stang H., Appel E., Schill E., Gautam P., 2001: Detailed analysis of successive pTRMs carried by pyrrhotite in Himalayan metacarbonates: an example from Hidden Valley, central Nepal. Geophys. J. Int., 146/3, 607-618.

Waldhoer M., Appel E., Frisch W., Patzelt A., 2001: Palaeomagnetic investigations in the Pamirs. J. Asian Earth Sci., 19/4, 429-451.

Neugebauer J., Greiner B., Appel E., 2001: Kinematics of the Alpine-W-Carpathian orogen and palaeogeographic implications. J. Geol. Soc. London, 158, 97-110.

Appel E., Li H., Patzelt A., Wang J., 1998: Palaeomagnetic results from Late Cretaceous and Early Tertiary Limestones from the Tingri Area in southern Tibet. J. Nepal Geol. Soc., 18, 113-124.

Schill E., Appel E., Gautam P., Singh S.K., 1998: Preliminary palaeomagnetic results of medium grade carbonates from the Lesser Himalaya. J. Nepal Geol. Soc., 18, 205-215.

Michel G., Waldhör M, Neugebauer J., Appel E., 1995: Sequential rotation of stretching axes, a result of block rotation ? A structural and paleomagnetic study along the North Anatolian Fault. Tectonophysics, 243, 97-118.

Appel E., Patzelt A., Chouker C., 1995: Secondary palaeoremanence of Tethyan sediments from the Zanskar Range (NW-Himalaya). Geophys. J. Int., 122, 227-242.

Patzelt A., Li Huamei, Wang Junda, Appel E, 1996: Palaeomagnetism of Cretaceous to Tertiary sediments from southern Tibet: evidence for the extent of the northern margin of India prior to the collision with Eurasia. Tectonophysics, 259, 259-284.

Ratschbacher L., Appel E., 1993: Comment on "Paleomagnetic study of Eocene Quxu pluton of the Gangdese belt: crustal deformation along the Indus-Zangpo suture zone in southern Tibet" by Y. Otofuji et al.. Earth Planet. Sci. Lett., 115, 287-294.

Appel E., MĂŒller R., Widder R., 1991: Palaeomagnetic results from the Tibetan Sedimentary Series of the Manang area (north central Nepal). Geophys. J. Int., 104, 255-266.

Appel E., Patzelt A., 1989: Suitability of rocks from the Mudurnu area (North Anatolian Fault zone) for tectonomagnetic recording. In Zschau J., ErgĂŒnay O. (edts.): Turkish-German Earthquake Research Project. IASPEI Istanbul, 130-143.



Shallow Subsurface Geophysics:

Becht A., BĂŒrger C., Kostic B.,Appel E., Dietrich P. 2007: Hydraulic property estimation with cross-hole seismic tomography in gravel aquifers: evaluation of resolution effects. J. Hydrology., 336, 171-185.

Becht A., Appel E., Dietrich P., 2006: Analysis of multi-offset GPR data: a case study in a coarse-grained gravel aquifer. Near Surface Geophysics., 4 (4), 227-240.

Becht A., Tronicke J., Appel E., Dietrich P., 2004: Inversion strategy in crosshole radar tomography using information of data subsets. Geophysics, 69 (1), 222-230.

Diallo M.S., Prasad M., Appel E., 2002: Comparison between experimental results and theoretical predictions for P-wave velocity and attenuation at ultrsonic frequency. Wave Motion, 37(1), 1-16.

Tronicke J., Dietrich P., Wahlig U., Appel E., 2002: Integrating GPR and crosshole radar tomography: a validation experiment in braided river stream deposits. Geophysics., 67(5), 1516-1523.

Tronicke J., Dietrich P., Appel E., 2002: Qualitiy improvement of crosshole georadar tomography: pre- and post-inversion data analysis strategies. European J. Environm. Engin. Geophysics, 7, 59-73.

Tronicke J., Tweeton D.R., Dietrich P., Appel E., 2001: Improved crosshole radar tomography by using direct and reflected arrival times. J. Applied Geophysics, 47/2, 15-24

Diallo M., Appel E., 2000: Acoustic waves propagation in saturated porous media: reformulation of the Biot / Squirt Flow (BISQ) theory. J. Applied Geophysics, 44(4), 313-325.

Appel E., Wilhelm J., Waldhör M., 1997: Archaeological prospection of wall remains using geoelectrical methods and GPR. Archaeological Prospection, 4, 219-229.



Patents:

Patents:

 

Hoffmann V., Appel E., Rösler W., Petrovsky E., Kapicka A., Magiera T., Scholger R., Mauritsch H., 2003: Vorrichtung und Verfahren zur Messung physikalischer Parameter in Boden- und/oder Sedimentprofilen. Deutsches Patent Nr. 101 21 137, IPC: G01V 3/26.