Wave velocity and rock density paradox?

Practically it is known that seismic velocity increases as rock density increases, why then does the wave velocity equation involving elastic moduli and density indicate that velocity is inversely...

09 February 2021 1,843 3 View

How can the moment tensor inversion results can present good waveform fit (synthetic and observed waveform) from generalized Cut and Paste scheme?

Depending upon the distance of the seismic station from the epicentre, the quality of waveform data and the improvisation of the synthetic waveform on it is often a question. If the Pnl waveform...

31 December 2020 6,602 2 View

How to solve a finite difference equation with both time and space derrivatives?

23 December 2020 2,764 3 View

What is New Next Generation Attenuation Relationships (NNGAR) and how are they different from other attenuation relationships?

Dear researchers The provisions of ASCE 7-10 states that New Next Generation Attenuation Relationships (NNGAR) has been used in the process of Probabilistic Seismic Hazard Analysis (PSHA) to...

15 November 2020 1,132 4 View

How to solve a non linear system?

Hi everybody, I have a non linear system of 9 equations: F=A(F)F+B(F)g(F) F is a 9x1 vector of the unknowns, A(F) and B(F) are 9x9 matrixes which depend on F ang g(F) is a 9x1 vector which...

12 November 2020 9,972 6 View

Petrel- well coordinates issue?

Hi, After loading 2D seismic lines in Petrel, I added three exploratory wells ( which supposed to be within the same 2D area) but these wells appears off the interesting area when I visualized...

25 October 2020 8,272 4 View

How to run Seismic analysis for the following model in OpenSees..?

I have developed a 3 bay 5 story 2D frame in Opensees but I have problems with element load and application of seismic load in Opensees using an acceleration file. I always got an error namely...

27 September 2020 5,885 4 View

What causes the magnitude of the horizontal in situ stresses to change with depth and changes their regime?

a case study that I am working on, I noticed that one of the wells change its regime from strike-slip to normal regime passing thought a major unconformity, I understand the lithologic...

20 September 2020 5,257 6 View

In simple terms: to what extent do you believe classicial inversion frameworks provide more "general" estimates than learned frameworks?

This is more of a survey question than a query for precise mathematical detailing. Opinions are welcome!

10 September 2020 6,516 2 View

Is scaling period (T) recommended in seismic codes logical in order to scaling process of the earthquake records?

Dear researchers What is your opinion about the criterion recommended in seismic codes for determining scaling period, which are used to scale ground motion records? As you know, the mentioned...

27 August 2020 5,546 5 View