# Snuffler manual¶

Snuffler is a seismogram browser and workbench.

• read waveforms in Mini-SEED, SAC and other file formats
• visually browse through seismic waveform archives
• display real-time data streams
• snappy interface for zooming, panning, scrolling, filtering, rotating and scaling
• changes to controls give instantaneous visual feedback
• transparent handling of traces split into many files
• integrated manual picker
• extendable with user plugins (snufflings)
• gap-aware continuous waveform processing framework

## Invocation¶

snuffler [options] waveforms ...


Input waveforms can be any combination of the following data sources:

• waveform files of supported formats
• directories, which are recursively seached for waveform files
• pseudo URLs, which are used to open real-time data streams from different sources

The following pseudo URLs are supported:

seedlink://<host>[:<port>]/<pattern>

Acquire data through SeedLink from given <host>. The specified <pattern> is matched against strings of the form <network>.<station>.<location>.<channel>, where the placeholders stand for the corresponding IDs of each SeedLink data stream. To use this feature, slinktool must be installed.

school://<device>

Acquire data through serial line from “school seismometer”.

hb628://<device>[?rate=<rate>[&channels=<channels>]]

Acquire data from eight-channel USB-HB628 module. Example: to read channels 0, 3 and 5 from serial device /dev/ttyS0 at default rate (50Hz), use snuffler 'hb628:///dev/ttyS0?channels=035'. By default all channels are shown.

cam://<device>

Acquire data from Hamburg Univerisity Wiechert camera module.

## Options¶

-h, --help

show help message and exit

--format=FORMAT

assume files are of given FORMAT [default: from_extension]

--pattern=REGEX

only include files whose paths match REGEX

--stations=STATIONS

read station information from file STATIONS, this option can be given more than once. The format of the stations file is a simple five-column ASCII table where each line has the form

<net>.<sta>.<loc>  <latitude>  <longitude>  <altitude>  <sensor-depth>


<net>, <sta>, and <loc> are the network, station and location codes, respectively. <altitude> and <sensor-depth> are given in [m]. If network and location code are empty, use .<sta>., i.e. the dots should not be omitted.

--event=EVENT, --events=EVENT

read event information from file EVENT, this option can be given more than once

--markers=MARKERS

read marker information from file MARKERS, this option can be given more than once

--follow=N

follow real time with a window of N seconds

--cache=DIR

use directory DIR to cache trace metadata (default: pyrocko_0.3_cache_<username> in the system’s default temporary directory)

--force-cache

use the cache even when trace attribute spoofing is active (may have silly consequences)

--store-path=TARGET

store data received through streams to TARGET. If TARGET is a directory, filnames are automatically choosen. If more control over the filenames is needed, TARGET can be a filename template containing placeholders like %(KEY)s, where KEY is any of network, station, location, channel, tmin (time of first sample), tmax (time of last sample).

--store-interval=N

dump stream data to file every N seconds [default: 600]

--ntracks=N

initially use N waveform tracks in viewer [default: 24]

--opengl

use OpenGL for drawing

--debug

print debugging information to stderr

## Keystrokes¶

Key Effect
q Quit
f Toggle full screen mode
: Enter command
<space> Forward one page in time
b Backward one page in time
<pagedown> Scroll tracks one page down
<pageup> Scroll tracks one page up
+ Show one track more
- Show one track less
= Show initial number of tracks
g Go to selection / show all
n Go to next marker
p Go to previous marker
N Go to next event marker
P Go to previous event marker
a Select all markers currently visible
A Select all markers
d Deselect all markers
05 Change color of marker
<f1><f5> Convert to phase marker
e Convert to event marker / set active event / associate to event
<f10> Convert phase marker to normal marker
<backspace> Delete marker
<escape> Abort picking
? Help

## Mouse¶

Mouse Effect
Click and drag Zoom and pan
Click and drag on time axis Pan only
Click on marker Select marker
<shift> + click on marker Select additional marker
Wheel Scroll tracks vertically
<ctrl> + wheel Change number of tracks shown
Double-click Enter picking mode

## Commands¶

After pressing ‘:’ in the trace viewer, a command can be entered. To leave command mode press ‘<return>’.

Some of snuffler’s commands take a <pattern> argument. These may contain the following shell-style wildcards:

 * matches everything ? matches any single character [seq] matches any character in seq [!seq] matches any character not in seq

The pattern matching is done case-insensitive.

### Quick-search traces¶

Reduce traces shown in viewer to those matching a given pattern.

n|s|l|c [ <pattern> ]

<pattern> is matched against network, station, location, or channel ID of the traces depending on whether the n, s, l, or c command is used, respectively. Only one quick-search pattern is active at any time. The currently active pattern is cleared by calling any of these commands without an argument.

### Hide¶

Hide traces whose network, station, location, and channel IDs match a given pattern.

hide <pattern>
hide n|s|l|c <pattern>


Using the first form, <pattern> is matched against strings of the form <network>.<station>.<location>.<channel>, where the placeholders stand for the corresponding IDs of each trace.

Using the second form, <pattern> is matched against network, station, location, or channel ID of the trace depending on whether n, s, l, or c is given as first argument, respectively. For example, hide s <pattern> is short for hide *.<pattern>.*.*.

The patterns given to successive invocations of hide are accumulated in a blacklist. To remove patterns from that blacklist, use the unhide command.

Examples:

• To hide any BHZ channels of stations with ID HAM3, use hide *.ham3.*.bhz.
• To hide all LHZ channels use hide c lhz.
• To hide any LHE and LHN channels use hide c lh[en]
• Assuming stations are named S01S15, to remove all but S02 and S04, type hide s S0[!24] followed by hide s S1?.

### Unhide¶

Unhide traces previously hidden with the hide command.

unhide [ <pattern> ]
unhide n|s|l|c <pattern>


The <pattern> argument must exactly correspond to a pattern previously given to the hide command. When unhide is called without any arguments, all currently active hide patterns are cleared.

### Markers¶

Toggle marker visibility.

markers [0][1][2][3][4][5]
markers all
markers


The visibility of the markers can be set selectively with regard to their kind (color). Each number given in the argument to this command turns on visibility of the corresponding marker kind, all other markers are hidden. If no arguments are given, all markers are hidden. If the argument is all, all markers are shown.

### Scaling¶

Set scaling rules.

scaling <vmin> <vmax>
scaling <pattern> <vmin> <vmax>
scaling


Traces are scaled according to the range [<vmin>, <vmax>]. Either of <vmin> or <vmax> may be set to the string ‘nan’, to maintain automatic scaling for the corresponding limit. If three arguments are given, the first argument should be a pattern, restricting application of the given scaling rule to matching traces. If no arguments are given, any previously set scalings rules are cleared.

### Goto¶

goto YYYY-MM[-DD[ HH[:MM[:SS[.XXX]]]]]

The first form causes the viewer to jump to the given date and time. With the second form (when no date is given), the date is taken from the center of the currently visible time range. Using the third form, it jumps to the time of an event with the given <eventname>. The event marker is neither selected nor made active through this command.