You can use a very fast Auditing > Visible History > Delete ALL events.
Audit Entries should be purged automatically over time, the retention window is defined in Auditing > Auto Delete and Purging. What value do you have that set to? Is this volume likely for that period (ie is the purging not working?). There have been issues with auto-purging this accross databases, but AFAIK its all fine in current 5.2.11, 6.0.8 and 6.1 releases. What is your JIRA & JEMH version, what database do you have?
Manual purging can also be done, further information on steps required are on the project wiki.
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