Dr. Erol Kalkan, P.E.

QuakeLogic Inc.

Last seen: 16 dagar ago | Active since 2016

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I am a structural engineer and CEO of QUAKELOGIC. I earned my B.Sc. degree in Civil Engineering and M.Sc. degree in Engineering Seismology from the Middle East Technical University. My second M.Sc. degree in Structural Engineering is from the Bosporus (Bogazici) University in Turkey. My doctorate degree in Structural Engineering (major) and in Geotechnical Engineering (minor) is from the University of California, Davis. My postdoctoral studies were at the University of California, Berkeley. I authored and co-authored more than 120 peer-reviewed publications on various issues in structural engineering and engineering seismology. My research and publications are at www.quakelogic.net

Programming Languages:
Python, MATLAB, Fortran

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Submitted

SPECTRAL WHITENING
This function applies whitening to a given signal within user defined frequency band.

12 månader ago | 12 downloads |

Submitted

Time-domain Sinc Interpolation (Resampling)
Time-domain SINC resampling (interpolation) function with a simple example

12 månader ago | 14 downloads |

Submitted

Complex Mode Indicator Function (CMIF)
This is a robust complex mode indicator function, which can be used to identify Eigen values. A simple example is provided.

mer än ett år ago | 2 downloads |

Submitted

Spectral acceleration, velocity and displacement spectra
This is a MatLAB function to compute linear-elastic damped response spectrum of time series

mer än 4 år ago | 24 downloads |

Submitted

Nonlinear multi-axial constant ductility spectra (H,V,tilt)
Robust function to generate multi-component constant-ductility nonlinear-inelastic response spectra.

mer än 4 år ago | 1 download |

Answered
Finding the velocity from displacement
In regards to filtering the seismograms, I developed an automated algorithm: https://www.mathworks.com/matlabcentral/fileexchang...

nästan 5 år ago | 0

Submitted

An automated P-phase Arrival Time Picker with SNR output
PPHASEPICKER is a powerful tool for automatically picking P-phase onsets.

ungefär 5 år ago | 19 downloads |

Submitted

spikeRemoval
This function replace or delete unwanted spikes (outliers) exceeding the threshold value using histogram method.

ungefär 5 år ago | 8 downloads |

Submitted

smoothing function
smoothCurve offers various different window smoothing options.

ungefär 5 år ago | 2 downloads |

Submitted

An Automated S-phase Arrival Time Picker with SNR Output
SPHASEPICKER is a powerful tool for automatically picking S-phase onsets.

ungefär 5 år ago | 8 downloads |

Submitted

AUTODETECT BANDPASS FILTER CORNER FREQUENCIES
cornerFreqs automatically detects appropriate bandpass filter corner frequencies by comparing signal's spectrum with noise spect...

ungefär 5 år ago | 3 downloads |

Submitted

Crop and save MatLAB figure as PDF (savePDF)
This simple function nicely crop the figure and save it as PDF

ungefär 5 år ago | 3 downloads |

Submitted

inteFD
Computes integration of discrete time-signal in frequency domain

ungefär 5 år ago | 6 downloads |

Submitted

diffFD
Computes derivative of discrete time-signal in frequency domain

ungefär 5 år ago | 1 download |

Submitted

COMPUTE SMOOTH FOURIER AMPLITUDE SPECTRUM (smoothFAS)
This function computes Fourier amplitude spectrum and its smoothed version. For smoothing, it uses window averaging.

ungefär 5 år ago | 5 downloads |

Submitted

SMOOTHING FUNCTION FOR FOURIER AMPLITUDE SPECTRUM
smoothSpectra offers different smoothing options for Fourier amplitude spectrum. Default window function is Konno-Ohmachi.

ungefär 5 år ago | 9 downloads |

Submitted

Piecewise Cubic Spline Interpolation (from NUMERICAL RECIPES in C)
Piecewise Cubic Spline Interpolation (from NUMERICAL RECIPES in C)

ungefär 6 år ago | 5 downloads |

Submitted

xcorrFD(x,y)
xcorrFD takes two discrete time signals as input and calculates cross-correlation and delay

mer än 6 år ago | 3 downloads |

Submitted

Frequency Response Function of Accelerometer (Oscillator)
This code computes frequency response function (FRF) of an accelerometer (SDF Oscillator)

nästan 7 år ago | 1 download |

Submitted

TIME-DOMAIN CROSS-CORRELATION FUNCTION
xcorrTD takes two discrete time signals as input and calculates cross-correlation and delay

nästan 7 år ago | 7 downloads |

Submitted

NONLINEAR-INELASTIC RESPONSE HISTORY ANALYSIS OF A SDOF OSCILLATOR USING OPENSEES
Fast MatLAB function for nonlinear-inelastic time-history analysis of a SDOF oscillator.

nästan 7 år ago | 3 downloads |

Submitted

Decimate (Downsample) A Signal in Frequency Domain
Frequency domain decimation function to reduce the sampling rate of a signal to a lower rate.

nästan 7 år ago | 2 downloads |

Submitted

Epoch & Unix Timestamp Converter (epoch2UTC)
Converts an epoch/unix timestamp into a human readable date

nästan 7 år ago | 3 downloads |

Submitted

NONLINEAR-INELASTIC MULTI-AXIAL TIME RESPONSE ANALYSIS OF SDOF OSCILLATOR
Robust MatLAB function for nonlinear-inelastic time-history analysis of SDOF oscillator

nästan 7 år ago | 1 download |

Submitted

Graizer-Kalkan (2015) Ground-Motion Prediction Equation
Graizer-Kalkan (2015) Ground-Motion Prediction Equation for earthquake strong motion estimates.

ungefär 7 år ago | 4 downloads |

Submitted

Deconvolution of two discrete time signals in frequency domain
Compute deconvolution of two discrete time signals in frequency domain to study wave propagation.

ungefär 7 år ago | 6 downloads |

Submitted

P-PHASE ARRIVAL TIME PICKER BASED ON AKAIKE INFORMATION CRITERION
Computes P-phase arrival time in windowed digital single-component seismic recording using AIC

mer än 7 år ago | 5 downloads |

Submitted

Frequency-domain Zero-padding Resampling (Interpolation)
Frequency domain (FFT-based) resampling of discrete-time signal

mer än 7 år ago | 3 downloads |

Submitted

Nonlinear-inelastic constant yield displacement response spectra
Compute nonlinear-inelastic constant yield displacement response spectra and input energy parameters

mer än 7 år ago | 5 downloads |