Canie -
The SCSN catalog site is now showing all these events located in a small cluster
I have provided the URL below. So, when this source says they were mislocations,
it means the events occurred but because of the cultural noise in the area, they
were located poorly by the local network automatic system, but were better located
after manual adjustments and reading.
I responded to the source regarding the question of depth that several studies
have shown that large earthquakes in California tend to initiate rupture at depths
near the brittle-ductile transition zone. The ductile region moves continuously, the
brittle region moves not at all, so there is a region between the two where large
amounts of strain are built up. It is in this depth range 15-25 km where large
earthquakes initiate because the strain has been built up there, not on the surface
or in the ductile zone but in between the two. The earthquakes on or near
the surface do little to relieve tectonic strain in the region. Therefore, the fact
that these events occurred in the region where strain is building up may mean
that a large event is closer than we imagined.
As this source (which by the way is not LJ) notes - who knows what is happening
at that depth - these events could easily connect up with the Newport Inglewood system
somewhere along the way. There are honest differences of opinion on matters
such as these.

• Southern California earthquakes