J. Park¹ , A. Shahbazi¹

¹Oregon State University

Abstract:

Literatures introduced ionospheric responses to earthquakes and volcanic eruptions in several decades. These events induce the Traveling Ionospheric Disturbances (TIDs) which can be detected by monitoring the temporal and spatial variation of electron content in the ionosphere. On 23 January 2018, multiple geophysical events along the ring of fire were reported. Although a few studies revealed there was no strong correlation between the events, it is still worth to observe the ionospheric reaction from those events for comparison. In this study, we selected the 7.9 Mw earthquake in the Gulf of Alaska and the Kusatsu-Shiranesan volcanic eruption in Japan as a case study. Analyzing the waveforms of TIDs generated from two types of events with the same space weather condition (as they happened on the same day) provides results of less uncertainty due to external conditions. The TIDs were extracted and detected from GNSS carrier phase observations recorded at nearby GNSS stations of each event. By a coherent analysis, a notable similarity and dissimilarity among the TIDs from the two events were revealed. This study suggests the effective approach to discriminate the signatures of ionosphere from a specific type of the earth geophysical event.