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Here we reconstruct the Viking seismic workflow and reinterpret the two Viking candidate events, recorded on sol 53 and sol 80, using the seismic context established by InSight. We show that the Viking seismometer was optimized for high\u2010spectral\u2010frequency seismic signals, consequently reducing its sensitivity to low\u2010spectral\u2010frequency events. If the original 10\u2010s S\u2010P travel\u2010time difference is correct, the inferred location of the sol 80 event overlaps the broad northern\u2010plains source region suggested for the seasonally recurrent high\u2010spectral\u2010frequency and 2.4\u2010Hz marsquake populations observed by InSight. Alternatively, if the first\u2010arrival phase represents a crustal conversion phase rather than a direct P wave, the sol 80 event corresponds to a distant tectonic (low\u2010spectral\u2010frequency or broadband) marsquake with an estimated moment magnitude of\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>W<\/jats:italic>\n                    <\/jats:sub>\n                    4.6\u20134.8 or\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>W<\/jats:italic>\n                    <\/jats:sub>\n                    4.9\u20135.1. A meteorite impact origin cannot be excluded either. The two Viking seismic signals decay more rapidly than typical InSight marsquakes, suggesting heterogeneity in the Martian attenuation structure. Together, these findings integrate Viking observations into the modern framework of Martian seismicity, illustrating how a legacy planetary data set can acquire renewed scientific implications when re\u2010examined in light of subsequent mission data.\n                  <\/jats:p>","DOI":"10.1029\/2026av002319","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T20:20:17Z","timestamp":1790799617000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fifty Years Later: Revisiting Viking 2 Seismic Signals Through InSight"],"prefix":"10.1029","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2224-1684","authenticated-orcid":false,"given":"Wanbo","family":"Xiao","sequence":"first","affiliation":[{"name":"SKLab\u2010DeepMinE MOEKLab\u2010OBCE School of Earth and Space Sciences Peking University  Beijing China"},{"name":"State Key Laboratory of Earthquake Dynamics and Forecasting Peking University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7525-5401","authenticated-orcid":false,"given":"Jiaqi","family":"Li","sequence":"additional","affiliation":[{"name":"SKLab\u2010DeepMinE MOEKLab\u2010OBCE School of Earth and Space Sciences Peking University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7170-3008","authenticated-orcid":false,"given":"Yanbin","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Earthquake Dynamics and Forecasting Peking University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7677-0835","authenticated-orcid":false,"given":"Andrew","family":"Lazarewicz","sequence":"additional","affiliation":[{"name":"The Viking Seismology Team  Pasadena CA USA"},{"name":"Retired"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"13","published-online":{"date-parts":[[2026,9,30]]},"reference":[{"key":"e_1_2_8_1_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.194.4271.1318"},{"key":"e_1_2_8_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0019\u20101035(72)90147\u20109"},{"key":"e_1_2_8_1_4_1","doi-asserted-by":"publisher","DOI":"10.1029\/JS082i028p04524"},{"key":"e_1_2_8_1_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41561\u2010020\u20100544\u2010y"},{"key":"e_1_2_8_1_6_1","doi-asserted-by":"publisher","DOI":"10.1785\/0120210045"},{"key":"e_1_2_8_1_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/gji\/ggac391"},{"key":"e_1_2_8_1_8_1","doi-asserted-by":"publisher","DOI":"10.1190\/tle33060606.1"},{"key":"e_1_2_8_1_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pepi.2020.106597"},{"key":"e_1_2_8_1_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pepi.2022.106943"},{"key":"e_1_2_8_1_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pepi.2020.106595"},{"key":"e_1_2_8_1_12_1","doi-asserted-by":"publisher","DOI":"10.1029\/2020JE006599"},{"key":"e_1_2_8_1_13_1","doi-asserted-by":"publisher","DOI":"10.1029\/2025JE009229"},{"key":"e_1_2_8_1_14_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.adk7615"},{"key":"e_1_2_8_1_15_1","volume-title":"Paper presented at 56th lunar and planetary science conference, the woodlands, TX, USA","author":"DellaGiustina D.","year":"2025"},{"key":"e_1_2_8_1_16_1","doi-asserted-by":"publisher","DOI":"10.1029\/2020JE006670"},{"key":"e_1_2_8_1_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pepi.2012.04.002"},{"key":"e_1_2_8_1_18_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11214\u2010019\u20100613\u2010y"},{"key":"e_1_2_8_1_19_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41561\u2010022\u201001014\u20100"},{"key":"e_1_2_8_1_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pepi.2011.06.015"},{"key":"e_1_2_8_1_21_1","doi-asserted-by":"publisher","DOI":"10.1785\/0120210079"},{"key":"e_1_2_8_1_22_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41561\u2010020\u20100539\u20108"},{"key":"e_1_2_8_1_23_1","doi-asserted-by":"publisher","DOI":"10.1029\/GL006i005p00368"},{"key":"e_1_2_8_1_24_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010021\u201026957\u20107"},{"key":"e_1_2_8_1_25_1","doi-asserted-by":"publisher","DOI":"10.1785\/0320220007"},{"key":"e_1_2_8_1_26_1","doi-asserted-by":"publisher","DOI":"10.1029\/GM104"},{"key":"e_1_2_8_1_27_1","volume-title":"Mars seismic catalogue, InSight mission; 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