@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix gsp: <http://www.opengis.net/ont/geosparql#> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.gov.au/dataset/f1455f86-eb9b-4261-9274-83395344d0ed> a dcat:Dataset ;
    dct:description """The principal magnitude type calculated by Geoscience Australia’s National Earthquake Alerts Centre (NEAC) in real-time monitoring of Australian earthquakes is the Australian local magnitude (<em>M</em>La). However, successive changes to seismic analysis systems and methods of pre-processing seismic waveforms over the years have led to changes in how <em>M</em>La has been calculated. These changes in <em>M</em>La estimation have led to biases for the Australian earthquake catalogue. The waveforms of 862 confirmed earthquakes between August 2023 – August 2024 were prefiltered to three high-pass corner frequencies (0.10 Hz, 0.50 Hz, and 0.75 Hz) from which the <em>M</em>La was recalculated. Quality selection criteria were applied targeting signal-to-noise ratios, minimum number contributing stations and the maximum distance of stations.

The number of network <em>M</em>La estimates that met the quality selection criteria increased with increasing high-pass corner filtering (445 earthquakes for the unfiltered <em>M</em>La versus 695 for <em>M</em>La filtered to 0.75 Hz), which is attributed to the improvement of the SNR where prefiltering dampens background noise. The removal of background noise also resulted in a predominant decrease in magnitude estimates. Although this study does not consider potential<em> M</em>La biases due to the measurement of large amplitude <em>Rg</em> phases, the study does provide recommendations for waveform pre-processing for magnitude estimates in the future. The recommendations provide more robust and consistent <em>M</em>La estimates that will be ingested into the national earthquake catalogue. This will yield improved earthquake rate estimates for seismic hazard assessments in Australia.

Presented at the 2025 Australian Earthquake Engineering Society (AEES) National Conference""" ;
    dct:identifier "f1455f86-eb9b-4261-9274-83395344d0ed" ;
    dct:issued "2026-01-08T14:10:59.502598"^^xsd:dateTime ;
    dct:language "eng" ;
    dct:modified "2026-01-08T14:10:59.502605"^^xsd:dateTime ;
    dct:publisher <https://data.gov.au/organization/91f054ec-d0c3-4d42-a89a-5daa2c7a6818> ;
    dct:spatial [ a dct:Location ;
            locn:geometry "POLYGON ((112.9200 -54.7500, 159.1100 -54.7500, 159.1100 -9.2402, 112.9200 -9.2402, 112.9200 -54.7500))"^^gsp:wktLiteral ] ;
    dct:title "Updated Procedures to MLa Estimation for Australian Earthquakes" ;
    dcat:distribution <https://data.gov.au/dataset/f1455f86-eb9b-4261-9274-83395344d0ed/resource/32cab287-eff8-4153-a756-bb0ea03c4321>,
        <https://data.gov.au/dataset/f1455f86-eb9b-4261-9274-83395344d0ed/resource/c9dfeff0-4fa2-4da3-92e7-c3d0f188bbad> ;
    dcat:keyword "Australian earthquakes",
        "Published_External",
        "Seismology and Seismic Exploration",
        "earthquake catalogue",
        "earthquake magnitude" .

<https://data.gov.au/dataset/f1455f86-eb9b-4261-9274-83395344d0ed/resource/32cab287-eff8-4153-a756-bb0ea03c4321> a dcat:Distribution ;
    dct:description "Link to Abstract" ;
    dct:format "PDF" ;
    dct:issued "2026-01-08T14:10:59.504323"^^xsd:dateTime ;
    dct:modified "2026-01-08T14:10:59.493367"^^xsd:dateTime ;
    dct:title "Link to Abstract" ;
    dcat:accessURL <https://aees.org.au/wp-content/uploads/2025/11/58.-Julia-Muscella.pdf> .

<https://data.gov.au/dataset/f1455f86-eb9b-4261-9274-83395344d0ed/resource/c9dfeff0-4fa2-4da3-92e7-c3d0f188bbad> a dcat:Distribution ;
    dct:description "LInk to Conference Papers" ;
    dct:format "HTML" ;
    dct:issued "2026-01-08T14:10:59.504329"^^xsd:dateTime ;
    dct:modified "2026-01-08T14:10:59.493474"^^xsd:dateTime ;
    dct:title "LInk to Conference Papers" ;
    dcat:accessURL <https://aees.org.au/2025-papers/> .

<https://data.gov.au/organization/91f054ec-d0c3-4d42-a89a-5daa2c7a6818> a foaf:Agent ;
    foaf:mbox "clientservices@ga.gov.au" ;
    foaf:name "Geoscience Australia Data" .