We develop a methodology to compile an objective tremor catalog by combining the envelope cross-correlation method with clustering, utilizing distinctive event features that can differentiate tectonic tremors from non-tremor events. This approach enables tremor extraction without subjective criteria, allowing for the detection of short-duration tremors overlooked in previous studies. The event features are depth, the mean amplitudes at high and low frequencies, the ratio of these two amplitudes, and event duration, which is defined as the minimum period within which 50 % of the seismic energy is concentrated. The application of this method for western Japan detects 1.7 times more tremors compared with previous studies, with durations of 0.3 to ~100 s. The events with short durations are considered to be low-frequency earthquakes. The relationship between seismic moment and the duration of the detected tremors adheres to the scaling law of slow earthquakes.