Earth-Tremors in Japan

Non-volcanic deep low-frequency tremors accompanying slow slips in the southwest Japan subduction zone

Non-volcanic deep low-frequency tremors in southwest Japan exhibit a strong temporal and spatial correlation with slow slip detected by the dense seismic network. The tremor signal is characterized by a low-frequency vibration with a predominant frequency of 0.5–5 Hz without distinct Por S-wave onset. The tremors are located using the coherent pattern of envelopes over many stations, and are es...

Tremors of the smile.

Pathophysiology of nonparkinsonian tremors.

Patients with nonparkinsonian tremors are the second largest group treated with functional neurosurgery. We summarize the present pathophysiological knowledge of these conditions. Essential tremor (ET) may be due to oscillations within the olivocerebellar circuit. There is experimental evidence from animal models for such a mechanism, and clinical data indicate an abnormal function of the cereb...

Concurrent Parkinson tremors.

1. Concurrent resting and postural tremors of patients with idiopathic Parkinson's disease were monitored using transducers responding to angular velocity of rotation. Spectra and correlation functions were calculated for each pair of records. 2. When concurrent tremor spectra share indistinguishable fundamental frequencies, have statistically significant peaks in their coherence spectra at tho...

Quantitative Analysis of Tremors in Welders

BACKGROUND Workers chronically exposed to manganese in welding fumes may develop an extra-pyramidal syndrome with postural and action tremors. OBJECTIVES To determine the utility of tremor analysis in distinguishing tremors among workers exposed to welding fumes, patients with Idiopathic Parkinson's Disease (IPD) and Essential Tremor (ET). METHODS Retrospective study of recorded tremor in s...