جستجو در تالارهای گفتگو

NGA-West2 Ground Motion Model for the Average Horizontal Components of PGA, PGV, and 5% Damped Linear Acceleration Response Spectra Kenneth W. Campbella) M.EERI, and Yousef Bozorgniab) M.EERI We used an expanded PEER NGA-West2 database to develop a new ground motion prediction equation (GMPE) for the average horizontal components of PGA, PGV, and 5% damped linear pseudo-absolute acceleration response spectra at 21 periods ranging from 0.01 s to 10 s. In addition to those terms included in our now superseded 2008 GMPE, we include a more-detailed hanging wall model, scaling with hypocentral depth and fault dip, regionally independent geometric attenuation, regionally dependent anelastic attenuation and site conditions, and magnitude-dependent aleatory variability. The NGA-West2 database provides better constraints on magnitude scaling and attenuation of small-magnitude earthquakes, where our 2008 GMPE was known to be biased. We consider our new GMPE to be valid for estimating horizontal ground motion from shallow crustal continental earthquakes in an active tectonic domain for rupture distances ranging from 0 km to 300 km and magnitudes ranging from 3.3 to 7.5–8.5, depending on source mechanism. [DOI: 10.1193/062913EQS175M] به نقل از گروه تلگرام دستنامه زلزله دانلود از پیوست campbell2014.pdf

NGA-West2 Equations for Predicting PGA, PGV, and 5% Damped PSA for Shallow Crustal Earthquakes David M. Boore,a) Jonathan P. Stewart, M.EERI, Emel Seyhan,c) M.EERI, and Gail M. Atkinson,d) M.EERI We provide ground motion prediction equations for computing medians and standard deviations of average horizontal component intensity measures (IMs) for shallow crustal earthquakes in active tectonic regions. The equations were derived from a global database with M 3.0–7.9 events. We derived equations for the primary M- and distance-dependence of the IMs after fixing the VS30-based nonlinear site term from a parallel NGA-West2 study. We then evaluated additional effects using mixed effects residuals analysis, which revealed no trends with source depth over the M range of interest, indistinct Class 1 and 2 event IMs, and basin depth effects that increase and decrease long-period IMs for depths larger and smaller, respectively, than means from regional VS30-depth relations. Our aleatory variability model captures decreasing between-event variability with M, as well as within-event variability that increases or decreases with M depending on period, increases with distance, and decreases for soft sites. [DOI: 10.1193/070113EQS184M] به نقل از گروه تلگرام دستنامه زلزله دانلود از پیوست boore2014.pdf

اثر سازه زيرزميني بر حداکثر شتاب سطح زمين در دو حالت رفتار خطي و غيرخطي خاک نویسنده(گان) : محمد حسن بازيار, مسعود رابطی مقدم, Dong-Soo Kim, Yun Wook Choo, در مقاله حاضر بعد از صحت سنجي يك مدل عددي با نتايج آزمايشات سانتريفيوژ انجام گرفته بر روي يك تونل متـرو، اثـر سـازه زيرزميني بر حداكثر شتاب سطح زمين در دو حالت رفتارخطي و غيرخطي خاك مورد مقايسه قرار گرفته است. نتايج نشان ميدهد در محـدوده فركانس طبيعي سيستم، مدل غيرخطي، كوچك نمايي PGA در اثر حضور سازه نسبت به ميدان آزاد را نشان ميدهد؛ در حاليكه در مدل خطـي عكس اين روند مشاهده ميشود. در محدوده فركانسهاي خارج از فركانسهاي طبيعي سيستم، ضريب بزرگنمايي در مـدل خطـي و غيرخطـي نزديك به يكديگر بوده و هر دو مدل در فركانسهاي پايين، بزرگنمايي و در فركانسهاي بالا، كوچكنمايي PGA نسبت به ميـدان آزاد را نشـان ميدهند. منبع: [Hidden Content] دانلود: [Hidden Content] 21103_092715181233.pdf