What are the specifics of the scrolling event?

I’m trying to pinpoint the source of an issue and it would be helpful to know: when you’re scrolling vertically in an Ionic app, what’s the event that is being captured, and what element has the event listener? The structure I’m seeing in the browser is this:

  ion-nav-view
    ion-side-menus
      ion-side-menu-content
        ion-nav-view
          ion-view
            ion-content
              div.scroll

It’s the div that’s actually scrolling via changes to the value of its -webkit-transform property. But what element actually has the event listener for the user’s gesture, and what event is it listening for? Thanks!