# Expanding Moment Magnitude Pools for Earthquake Magnitude Homogenization
## 3 Results
### Indonesia  
A map showing the epicenters of the search results is shown in Figure 1, demonstrating high seismicity in the region. A total of 105,327 events are in the Indonesian catalog with major contributions from ISC, NEIC, and DJA. Although moment magnitudes from NEIC include M\({}_{\rm W}\), M\({}_{\rm WW}\), M\({}_{\rm WVC}\), M\({}_{\rm WJB}\), M\({}_{\rm WJR}\), there is an issue of timing. NEIC published M\({}_{\rm W}\) from 1980 to 2013 and then changed to a combination of M\({}_{\rm WW}\), M\({}_{\rm WVC}\), M\({}_{\rm WJB}\), and M\({}_{\rm WJR}\) thereafter [22; 30]. Indonesian earthquakes with NEIC moment magnitudes are plotted in Figure 2, demonstrating the timeframes when each type is valid. On the other side, Figure 3 shows DJA has an approximate 4-year gap for earthquakes with a recorded M\({}_{\rm W}\), from 2007 to 2009 and then from 2013 to 2019, however for M\({}_{\rm WIP}\), DJA seems to show continuous record-keeping from 2007 to 2019. Additionally plotted in Figure 3 are some of the earthquakes from bibliographic-based sources, namely EVBIB and P&S. EVBIB only goes from 1964 to 1976, while the catalog from P&S spans 1907 to 1987. Note that both EVBIB and P&S are no longer operational, as shown in Table 1. \begin{table}
\begin{tabular}{c l c c} \hline
**Code** & **Agency** & **Country** & **Status** \\ \hline CGS & Coast and Geodetic Survey of the United States & U.S.A. & Inactive \\ DJA & Badan Meteorologi, Klimatologi dan Geofisika & Indonesia & Active \\ EVBIB & Data from publications listed in the ISC Event Bibliography & Unknown & Inactive \\ GCMT & The Global CMT Project & U.S.A. & Active \\ GS & U.S. Geological Survey & U.S.A. & Active \\ HRVD & Harvard University & U.S.A. & Inactive \\ IPGP & Institut de Physique du Globe de Paris & France & Active \\ ISC & International Seismological Centre & U.K. & Active \\ ISC-GEM & Global Instrumental Earthquake Catalogue & U.K. & Active \\ ISC-PPSM & International Seismological Centre Probabilistic Point Source Model & U.K. & Active \\ ISS & International Seismological Summary & U.K. & Inactive \\ JMA & Japan Meteorological Agency & Japan & Active \\ KMA & Korea Meteorological Administration & South Korea & Active \\ MOS & Geophysical Survey of Russian Academy of Sciences & Russia & Active \\ NEIC & National Earthquake Information Center & U.S.A. & Active \\ NEIS & National Earthquake Information Service & U.S.A. & Active \\ NIED & National Research Institute for Earth Science and Disaster Resilience & Japan & Active \\ P& P&& Checo and Sykes catalog [29] & Unknown & Inactive \\ USCGS & United States Coast and Geodetic Survey & U.S.A. & Active \\ \hline \end{tabular}
\end{table} 
Table 1: Seismological agencies and projects that provided relevant earthquake data for this study. A tally of the different magnitude types is shown in Table 2. To present a more concise tally, all types of moment magnitude are listed under M\({}_{\rm W}\), all surface wave type magnitudes for NEIC are listed under M\({}_{\rm S}\), and all local magnitude types for DJA are listed under M\({}_{\rm L}\). Figure 1: Epicenters of earthquakes in the compiled catalog for Indonesia. Figure 3: Moment magnitude types from DJA and bibliographic sources, and timeframes when they are valid in the Indonesian catalog. Figure 2: Moment magnitude types from NEIC and timeframes when they are valid in the Indonesian catalog. The table shows that the initial number of earthquakes recorded under M\({}_{\rm W,GCMT}\) is 3915. The number of earthquakes in the M\({}_{\rm W,GCMT}\)-related pool is 3977, with additions of 53, 3, and 6 events from ISC-GEM, EVBIB, and HRVD, respectively. The initial base of the M\({}_{\rm W,GCMT}\)-hypothesis pool contained 3971 earthquakes from GCMT, ISC-GEM (GCMT and bibliographic sources), and EVBIB as stated previously.