Event Details
Operating System->Microsoft Windows->Built-in logs->Windows 2008 or higher->Security Log->110X - Non Audit (EventLog)->Log clear->EventID 1102 - The audit log was cleared.
EventID 1102 - The audit log was cleared.

This event record indicates that the audit log has been cleared. This event is always recorded, regardless of the audit policy. It is recorded even if auditing is turned off.

Note:
The audit log should be saved in a file before deleting. The practice of always saving copies of audit logs is good for catching fraudulent users. A fraudulent user with sufficient privileges can delete the audit log as a way of erasing evidence of tampering with the computer systems and files. Lack of a backed-up audit log will help trace an unauthorized user. Once deleted, an audit log is lost unless a copy was made and saved before deleting.

Find more information about this event on ultimatewindowssecurity.com.

Corresponding events on other OS versions:

Windows 2000, 2003
 Sample: 
        The audit log was cleared.
        Subject:
        Security ID:	%1
        Account Name:	%2
        Domain Name:	%3
        Logon ID:	%4
Log Type: Windows Event Log
 Uniquely Identified By:
Log Name: Security
Filtering Field Equals to Value
OSVersion Windows Vista (2008)
Windows 7 (2008 R2)
Windows 8 (2012)
Windows 8.1 (2012 R2)
Windows 10 (2016)
Source Microsoft-Windows-Eventlog
TaskCategory Log Clear
EventId 1102
Field Matching
FieldDescriptionStored inSample Value
DateTime Date/Time of event origination in GMT format. DateTime 10.10.2000 19:00:00
Source Name of an Application or System Service originating the event. Source Security
Type Warning, Information, Error, Success, Failure, etc. Type Success
User Domain\Account name of user/service/computer initiating event. User RESEARCH\Alebovsky
Computer Name of server workstation where event was logged. Computer DC1
EventID Numerical ID of event. Unique within one Event Source. EventId 576
Description The entire unparsed event message. Description Special privileges assigned to new logon.
Log Name The name of the event log (e.g. Application, Security, System, etc.) LogName Security
Task Category A name for a subclass of events within the same Event Source. TaskCategory
Level Warning, Information, Error, etc. Level
Keywords Audit Success, Audit Failure, Classic, Connection etc. Keywords
Category A name for an aggergative event class, corresponding to the similar ones present in Windows 2003 version. Category Account Logon
Object Name -
Whom -
Object Type -
Class Name -
Security ID -
Account Name -
Account Domain -
Subject: Security ID SID of the account initiating action InsertionString1
Subject: Account Name Name of the account initiating action InsertionString2
Subject: Domain Name Name of the domain that account initiating action belongs to InsertionString3
Subject: Logon ID Initiator's Logon ID InsertionString4
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