Verbose logginglevel to Default - Stsadm command

stsadm -o setlogginglevel -tracelevel none

1. At the Windows PowerShell command prompt (that is, PS C:\>), type the following command, and then press ENTER:
   Set-SPLogLevel -TraceSeverity {None | Unexpected | Monitorable | Medium | High | Verbose} -EventSeverity {None | Information | Warning | Error | Critical | Verbose} [-Identity <Category name…>]  -Verbose
   You can use the Identity parameter to specify one or more categories to change — for example, Administration. If you do not specify the value for the Identityparameter, all categories are changed.
   To view the current settings, type Get-SPLogLevel, and then press ENTER.
   To set all categories back to default levels, type Clear-SPLogLevel, and then press ENTER.