Apollo Missions to the Moon 
Passive Seismic Experiments (PSE) from Apollo Lunar Surface Experiments Package (ALSEP)
and Early Apollo Scientific Experiments Package (EASEP)

Overview
========

This bundle contains the following collections:

data_seed:   
  Seismic observations in MiniSEED format and associated metadata in 
  Dataless SEED format. SEED is the Standard for Exchange of 
  Earthquake Data maintained by the International Federation of 
  Digital Seismograph Networks (www.fdsn.org).
           
data_table:  
  The same seismic observations converted to PDS-compliant ASCII text 
  tables (GeoCSV format) and associated metadata in XML files 
  (StationXML format).
       
This bundle also contains the document collection, which includes the 
following documents.
  apollo_pse_description.pdf
       The Apollo PSE description document
       
The Apollo PSE Description Document is the primary documentation for the 
Apollo PSE archive. Data users should also refer to the following paper
which describes the how the archive was processed: 

Nunn, C., Nakamura, Y., Kedar, S., Panning, M. P., 2022, A New 
Archive of Apollo’s Lunar Seismic Data, Planet. Sci. J., 3 219, 
https://iopscience.iop.org/article/10.3847/PSJ/ac87af

There is a GitHub site which accompanies the paper:
https://github.com/cerinunn/pdart
Data users should read the Getting Started page: 
https://github.com/cerinunn/pdart/blob/master/getting_started.ipynb.

Each document and data product in this bundle is described by a PDS4
label in a separate file with the same name but with the extension "xml".
PDS4 labels are XML (eXtended Markup Language) files that conform to
the PDS4 Information Model XML schema at
https://pds.nasa.gov/pds4/schema/released/. They are best viewed in an
XML-aware text editor, and may be used by software that can manipulate 
XML documents. 

The Apollo Seismic Data Files
===================

Apollo data products are classified as "continuous".
A continuous data product spans one Earth day, midnight to midnight UTC.
The time that each sample was received on Earth is recorded in the 
timing trace ATT. Note that this is the time received on Earth, and is 
therefore not the time the record was sampled. The timing includes effects
from the Moon-Earth distance and the rotation of the Earth.

The SEED and ASCII data collections are co-mingled under the 
data directory. The data directory tree uses the following
structure, with the SEED products and their ASCII equivalents in 
the lowest-level subdirectories.

For continuous data products: 

   data / [network] / continuous_waveform / [station] / [year] / [doy]

The Dataless SEED metadata files that correspond to the Mini-SEED data
products, along with their ASCII equivalents, are stored in this 
directory structure:

   data / [network] / metadata /

The file formats of Apollo seismic data products are summarized in Table 1.

_______________________________________________________________________________
Table 1. Apollo Seismic File Formats

File Contents  SEED Format    PDS-Compliant Format
-------------  -------------  --------------------------------------------------
Data           MiniSEED       GeoCSV (ASCII text in comma-separated value table)
Metadata       Dataless SEED  StationXML (ASCII text in XML format)
_______________________________________________________________________________


The file naming conventions are given in Table 2. Each data file is accompanied
by a PDS label with the same name but with the extension ".xml". 

_______________________________________________________________________________
Table 2. Apollo Seismic Data File Naming 

Continuous data  
---------------
Directory:            data/[network]/continuous_waveform/[station]/[year]/[doy]/
                      
MiniSEED data file:  [network].[station].[location].[channel].[year].[doy].[rev].mseed
MiniSEED data label: [network].[station].[location].[channel].[year].[doy].[rev].xml
                      
ASCII CSV data file:  [network].[station].[location].[channel].[year].[doy].[rev].a.csv
ASCII CSV data label: [network].[station].[location].[channel].[year].[doy].[rev].a.xml

Location codes are specified for the mid-period channels (MH1, MH2 and MHZ):
'00' for peaked-mode operation and '01' for flat-mode operation. 
Location is not specified for the short-period channel (SHZ) or the timing
trace (ATT).


Metadata
--------
Directory:            data/[network]/metadata/

Dataless SEED metadata file:   dataless.[network].[rev].seed 
Dataless SEED metadata label:  dataless.[network].[rev].xml
                      
StationXML metadata file:      stationxml.[network].[rev].sxml
StationXML metadata label:     stationxml.[network].[rev].xml
                
_______________________________________________________________________________
                    

This bundle was created and archived by the Geosciences Node of the Planetary 
Data System. Questions about this bundle may be directed to 
geosci@wunder.wustl.edu.
Last updated 2022-09-23.