Spikes manifest in intra-day markets frequently. These are often short-lived and associated with buying/selling programs more often than change in fundamental factors, particularly in low-liquidity periods. In evaluating duration and variance measures was trying to determine reasonable jump thresholds.
Below is a price series demonstrating a variety of spiking behavior:
Taking a look at the region around the jump at high frequency, we note that the jump did not occur with one trade rather with multiple within a short space of time:
From a duration perspective, if we want to capture the spike as one event of a given magnitude we either need to consider the cumulative return over a given window or sample with a longer period. Here is the same with a 2 second sample:
Here is the 2 second sampling of the original range. With the longer sample period, the spikes in return are more evident (compare to the first graph in the post):