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From Initial Models of Seismicity, Structure and Noise to Synthetic Seismograms for Mars

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The InSight mission will land a single seismic station on Mars in November 2018, and the resultant seismicity catalog will be a key component for studies aiming to understand the interior structure of the planet. Here, we present a preliminary version of the web services that will be used to distribute the event and station metadata in practice, employing synthetic seismograms generated for Mars using a catalog of expected seismicity. Our seismicity catalog consists of 120 events with double-couple source mechanisms only. We also provide Green’s functions databases for a total of 16 structural models, which are constructed to reflect one-dimensional thin (30 km) and thick (80 km) Martian crust with varying seismic wave speeds and densities, combined with two different profiles for temperature and composition for the mantle. Both the Green’s functions databases and the precomputed seismograms are accessible online. These new utilities allow the researchers to either download the precomputed synthetic waveforms directly, or produce customized data sets using any desired source mechanism and event distribution via our servers.

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We would like to thank Naomi Murdoch and David Mimoun for making their Martian noise model available prior to publication, and Francis Nimmo for kindly sharing his visco-elastic attenuation code. This work was supported by grants from the Swiss National Science Foundation (SNF-ANR project 157133 “Seismology on Mars”) and the Swiss National Supercomputing Center (CSCS) under project ID s682. The InSight Contribution Number (ICN) of this paper is 27.

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Correspondence to Savas Ceylan.


Appendix A: Example Python Code Snippet for Accessing Instaseis Servers to Retrieve Synthetic Waveforms

# Import obspy and instaseis packages

import instaseis

import obspy

# Connect to the desired database. Replace DATABASE_NAME with a database

# hosted at the ETH server listed at the URL below.

db = instaseis.open_db(’’)

# Create a receiver/source pair or use a whole obspy.Catalog in a loop

receiver = instaseis.Receiver(

 latitude=4.5, longitude = 136.0, network = ”7J”, station = ”SYNT1”)

# Define a source using strike/dip/slip angles. M0 is in Nm.

source = instaseis.Source.from_strike_dip_rake(

 latitude=0.0, longitude=0.0, depth_in_m=50000,

  strike=130.0, dip=15.0, rake\({=}-90.0\), M0=1E19,

 origin_time=obspy.UTCDateTime(2020, 1, 2, 3, 4, 5))

# Or define a source with moment tensor: Note that above line does not

# correspond to the moment tensor definition below.

source = instaseis.Source(

 latitude=0.0, longitude=0.0, depth_in_m=50000,







 origin_time=obspy.UTCDateTime(2020, 1, 2, 3, 4, 5))

# Retrieve the waveforms: seismogram is an obspy.Stream object

seismogram = db.get_seismograms(source=source, receiver=receiver)

# Do some processing as needed.

seismogram.filter(“highpass”, freq=1.0)

# Plot the waveforms.


Appendix B: Using the Instaseis REST-like API

To download waveforms, the parameters should be combined together in a HTTP request string as the following. This string later can be used from any browser’s address bar or in conjunction with a tool such as wget. Waveforms can be extracted as zipped SAC or miniSEED files using the format option. Instaseis supports additional end-points for retrieving Green’s functions, event and station info. Further information is available at An example output for the HTTP command below is shown in Fig. 9. Note that Instaseis automatically assigns the component names (MX*), and can be changed as needed.

Fig. 9
figure 9

Example output of REST-like API command. The waveforms are in displacement units as it is the default output type the GF database,15,90,1E19&origintime=2020-1-2T03:04:05&networkcode=7J&stationcode=SYNT1&locationcode=00&format=miniseed

Appendix C: Examples for Using Standard FDSN Web Services to Retrieve Data

Below are some examples for downloading data using FDSN web services. Further examples are available at URL.

In order to request station metadata for all BX* channels of station SYNT1 in XML format:*&level=channel

To request the same metadata above in text format, provide the format statement in the query URL:*&level=channel&format=text

To retrieve catalog information between two dates with \(M \geq 2.5\) in text format:

To download waveforms as miniSEED files between two dates on network 7J for station SYNT1:

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Ceylan, S., van Driel, M., Euchner, F. et al. From Initial Models of Seismicity, Structure and Noise to Synthetic Seismograms for Mars. Space Sci Rev 211, 595–610 (2017).

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