@article{CTT100717844,
  author = {Rhommel Grutas and Hiroaki Yamanaka},
  title = {Shallow shear-wave velocity profiles and site response characteristics from microtremor array measurements in Metro Manila, the Philippines},
  journal = {Exploration Geophysics},
  year = 2012,
}

@article{CTT100717909,
  author = {Hiroaki YAMANAKA and Kaoru OHTAWARA and Rhommel GRUTAS and Robert B. TIGLAO and Melchor LASALA and Ishmael C. NARAG and Bartlome C. BAUTISTA},
  title = {Estimation of site amplification and S-wave velocity profiles in metropolitan Manila, the Philippines, from earthquake ground motion records},
  journal = {Exploration Geophysics},
  year = 2011,
}