School of Earth and Environment

Alif Mohd Jelani Alif Mohd Jelani

Postgraduate Researcher

Email address: eemaam@leeds.ac.uk
Room: 8.153b

Affiliation: Institute of Applied Geoscience

Qualifications

  • Msc Environmental Geophysics Engineering (2012-2013)
  • Bsc Applied Physics (2009-2012)

Memberships/Fellowships

  • EAGE - European Association of Geoscientists & Engineers

Research Interests

  • Seismic tomography
  • Seismic waveform modelling
  • Seismic anisotropy
  • Environmental geophysics
  • Engineering geophysics

Teaching Interests

Currently, I am demonstrating these two MSC courses:

Project details

Project title

Wide-angle Seismic Reflection and Refraction Study of Seaward Dipping Reflector in Volcanic Passive Margins

Supervisors

Dr Adam Booth, Dr Douglas Paton and Prof Graham Stuart

Funding

Ministry of Education Malaysia Scholarship

Project outline

Seaward dipping reflectors (SDR) are unique features of volcanic passive margins and occur during the later stages of continental break-up. Basically, SDR are a series of horizons observed in seismic reflections. They form as wedge-shaped structures and dip towards the seaward direction. SDR are an expression of the rapid extrusion of flood basalt, either during rifting or the initial stages of seafloor spreading. These features are known as volcanic accumulations and are normally found across continent-ocean transition zones. In term of economic potential, the role of volcanic passive margins is believed to be important as they supply thermal energy to the margin and so can influence the maturity of source rocks. Although it is generally understood that the transition from continental to oceanic crust is characterized by SDR of volcanic provenance, detailed structure and geometry of the features remains poorly defined or constrained. Based on seismic refraction and reflection data, imaging of the lower part of the SDR sequences becomes very difficult.

The obscure image of SDRs in the seismic profiles lead to questions about the structure of volcanic passive margins and their evolution.Some of the key questions include (i) what is the geometry of main segments of the SDRs and (ii) what is the composition of the volcanic material? Hence, I will focus on improving the imaging of the geometry of volcanic passive margins as well as constraining their composition. Other benefits of the research include (i) refining our understanding of the nature of lithospheric and its underlying structure in terms of velocity heterogeneity across the continent-ocean transition; (ii) extracting evidence of thinned oceanic crust under the continent-ocean transition area; and (iii) determining how SDRs are associated with tectonic and rifting activities in volcanic passive margins. In my PhD research, I will focus on improving the imaging of the geometry of volcanic passive margins as well as constrain their composition. Specifically, I will study geometry and compositional variation across continent-ocean transition in the volcanic passive margin in Orange Basin by applying seismic tomography on large-offset (<7km) marine seismic data. Large-offset seismic data has been chose because it will allow a large range of incident angle that will penetrate a greater depth into the transition zone (Zelt and Forsyth, 1994).