Report of Zassikai on April 22, 2004

[DATE: April 22, 2004 (Thu.) 10:30 - 12:30]

場 所：防災研究所D570室（本館5階）

[PLACE: Room #D570, DPRI]

Reporter: | 岩田 知孝 [Tomotaka Iwata] |

Title: |
Beresnev, I. A. (2003). Uncertainties in Finite-Fault Slip Inversions: To What Extent to Believe? (A Critical Review), Bull. Seism. Soc. Am. 93(6), 2445-2458. |

Summary: |
The author pointed out the following problems on kinematic source inversions. (1) Numerical stabilization and geological constraints (2) Fixed parameters (rupture speed, fault geometry) (3) Grid-dependent results (4) fixed slip duration (5) sinc function(Figs. 1-3) (6) Inappripriate Green's function (7) Station geometory (coverage) The author's comments on the uncertainties of source inversion are sometimes one-sided and I could not agree in some portions. Assumptions of (1) and (2) are for not only to get the stabilization of solution, but also some constraints from a-priori information such as the geological and seismological evidence. Also, we try to select more plausible (that is, sometimes, one-sided) source models (At that point, we may play as one-sided modelings for getting a faverable source model). For the point (3), we need to confirm the resolution test for positioning of spatial discretization. It should be noted that the difference between slip velocity function and moment rate function at subfault. We also take care of the points of (4) and (5) to interpret the obtained source models. Appropriate Green's function is also important for this analysis and K-NET and KiK-net give us the appropriate distribution of stations on the view point of (7). There is some problematic for comparisons of Kocaeli earthquakes without considering rupture patterns. The source models with similar assumptions are similar each other. |

Return