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- 2015 Earthquake Summary Page<\/a><\/li>\n
- 2016 Earthquake Summary Page<\/a><\/li>\n
- 2017 Earthquake Summary Page<\/a><\/li>\n
- 2018 Earthquake Summary Page<\/a><\/li>\n
- 2019 Earthquake Summary Page<\/a><\/li>\n
- 2020 Earthquake Summary Page<\/a><\/li>\n<\/ul>\n<\/ul>\n
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- Here are the annual summaries for the Cascadia region.<\/li>\n
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- 2016 Earthquake Summary Page<\/a><\/li>\n
- 2017 Earthquake Summary Page<\/a><\/li>\n<\/ul>\n<\/ul>\n
- \nI include summaries of my earthquake reports in sorted into three categories. One may also search for earthquakes that may not have made it into these summary pages (use the search tool).<\/p>\n
- Magnitude<\/a><\/li>\n
- Region<\/a><\/li>\n
- Year<\/a><\/li>\n<\/ul>\n
- \nHere are the USGS web pages for each of the earthquakes plotted in the map below. This is the USGS query<\/a> that I used to create the map below.<\/p>\n
- 2015.02.13 M 7.1 northern Mid Atlantic Ridge<\/a><\/li>\n
- 2015.02.27 M 7.1 Indonesia<\/a><\/li>\n
- 2015.03.29 M 7.1 New Britain<\/a><\/li>\n
- 2015.04.25 M 7.8 Nepal<\/a><\/li>\n
- 2015.05.05 M 7.5 New Britain<\/a><\/li>\n
- 2015.05.07 M 7.1 Solomon Sea<\/a><\/li>\n
- 2015.05.12 M 7.3 Nepal<\/a><\/li>\n
- 2015.05.30 M 7.8 Izu Bonin<\/a><\/li>\n
- 2015.06.17 M 7.0 southern Mid Atlantic Ridge<\/a><\/li>\n
- 2015.07.18 M 7.0 Santa Cruz Islands<\/a><\/li>\n
- 2015.07.27 M 7.0 New Guinea<\/a><\/li>\n
- 2015.09.16 M 8.3 Illapel, Chile<\/a><\/li>\n
- 2015.09.16 M 7.0 Illapel, Chile<\/a><\/li>\n
- 2015.10.20 M 7.1 Vanuatu<\/a><\/li>\n
- 2015.10.26 M 7.5 Afghanistan<\/a><\/li>\n
- 2015.11.18 M 7.0 Solomon Islands<\/a><\/li>\n
- 2015.11.24 M 7.6 Peru<\/a><\/li>\n
- 2015.11.24 M 7.6 Argentina\/Brazil<\/a><\/li>\n
- 2015.12.04 M 7.1 Southeast Indian Ridge<\/a><\/li>\n
- 2015.12.07 M 7.2 Tajikistan<\/a><\/li>\n<\/ul>\n
Annual Summary Poster<\/font><\/h2>\n
Here is the map where I show the epicenters as white circles. I also plot the USGS moment tensors for each earthquake, with arrows showing the sense of motion for each earthquake.
\nI placed a moment tensor \/ focal mechanism legend in the lower left corner of the map. There is more material from the USGS web sites about moment tensors<\/a> and focal mechanisms<\/a> (the beach ball symbols). Both moment tensors and focal mechanisms are solutions to seismologic data that reveal two possible interpretations for fault orientation and sense of motion. One must use other information, like the regional tectonics, to interpret which of the two possibilities is more likely.
\nIn some cases, I am able to interpret the sense of motion for strike-slip earthquakes. In other cases, I do not know enough to be able to make this interpretation (so I plot both solutions).
\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/2015_annual_summary\/2015_summary_interpretation.jpg\")
<\/a><\/p>\n- \n
- \n
2015.02.13 Northern Mid Atlantic Ridge<\/a><\/h2>\n<\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150213_MAR\/20150213_MAR_interpretation.jpg\")
<\/a><\/p>\n- \n
2015.02.27 Indonesia<\/a><\/h2>\n<\/li>\n
- possibly related 2015.02.28 M 5.0<\/a><\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150227_indonesia\/20150227_indonesia_interpretation.jpg\")
<\/a><\/p>\n- \n
2015.03.29 New Britain<\/a><\/h2>\n<\/li>\n
- 2015.03.29 update #1<\/a><\/li>\n
- 2015.03.29 Tsunami Update<\/a><\/li>\n
- 2015.03.29 seismicity New Britain from 2000-2015<\/a><\/li>\n
- 2015.03.30 update #2<\/a><\/li>\n
- 2015.03.30 update #3 tectonic domains<\/a><\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150329_new_britain\/20150329_new_britain_interpretation_update.jpg\")
<\/a><\/p>\n- \n
- Tectonic Domain Map<\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150329_new_britain\/20150329_new_britain_segmentation_interpretation.jpg\")
<\/a>\n<\/ul>\n- \n
2015.04.25 Nepal<\/a><\/h2>\n<\/li>\n
- 2015.04.25 Nepal update #1<\/a> aftershock region<\/li>\n
- 2015.04.25 Nepal update #2<\/a> historic earthquakes<\/li>\n
- 2015.04.25 Nepal update #3<\/a> updated historic map and cross section<\/li>\n
- 2015.04.25 Nepal update #4<\/a> PGA, DYFI, Attenuation<\/li>\n
- 2015.04.25 Nepal update #5<\/a> Surface Displacement, Ground Motions<\/li>\n
- 2015.04.25 Nepal update #6<\/a> updated historic map and GIS data<\/li>\n
- 2015.04.25 Nepal update #7<\/a> surface deformation<\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150425_nepal\/20150425_nepal_interpretation_MMI.jpg\")
<\/a><\/p>\n- \n
2015.05.05 New Britain<\/a><\/h2>\n<\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150505_new_britain\/20150505_new_britain_interpretation.jpg\")
<\/a><\/p>\n- \n
2015.05.07 Solomon Sea<\/a><\/h2>\n<\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150507_bougainville\/20150507_bougainville_interpretation.jpg\")
<\/a><\/p>\n- \n
2015.05.12 Nepal aftershock<\/a><\/h2>\n<\/li>\n
- 2015.05.12 Nepal aftershock<\/a> update #1<\/li>\n
- 2015.05.12 Nepal aftershock<\/a> update #2<\/li>\n
- 2015.05.12 Nepal aftershock<\/a> update #3<\/li>\n
- 2015.05.12 Nepal aftershock<\/a> update #4<\/li>\n
The first moment tensor has been calculated and I have plotted this Mww MT on the map. There has also been a small M 5.6 aftershock to this M 7.3 aftershock. Here is the map, that also includes moment tensors from the main shock and the previously largest aftershock (M = 6.6). The magnitude of this large aftershock has been changed to M 7.3.
\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150512_nepal\/20150512_nepal_interpretation.jpg\")
<\/a><\/p>\n- \n
- Here is the map that I put together. I have placed the USGS epicenters with two color schemes. The size of the yellow dots represents earthquake magnitude. The degree of redness designates the time (earlier-April = pink & later-May = red). Note how there are some pink colored epicenters in the region of the M 7.3 earthquake. These pink colored earthquakes all occurred in April. The red ones are from May. These epicenters may not be plotted with the greatest certainty, though any uncertainty is possibly shared between them. So, there relative positions are possibly good.<\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150512_nepal\/20150425_nepal_local_aftershocks_20150513.jpg\")
<\/a><\/p>\n- Mw 7.8 Earthquake Finite Fault Plane Solution from the USGS<\/a>.<\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150425_nepal\/20150513_nepal_slip_model_7_8_aftershocks.jpg\")
<\/a><\/p>\n- Mw 7.3 Earthquake Finite Fault Plane Solution from the USGS<\/a>.<\/li>\n
\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150512_nepal\/20150513_nepal_slip_model_7_3_aftershocks.jpg\")
<\/a>\n<\/ul>\n- \n
2015.05.30 Izu Bonin<\/a><\/h2>\n<\/li>\n
- 2015.05.30 Izu Bonin update #1<\/a> triggered seismicity?<\/li>\n
- 2015.05.30 Izu Bonin update #2<\/a> Seismicity Animation: 1940-2015<\/li>\n
- 2015.05.30 Izu Bonin update #3<\/a> HiNet Animation<\/li>\n
- Mw 7.8 Earthquake Finite Fault Plane Solution from the USGS<\/a>.<\/li>\n
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Here are some maps that I put together for each of these earthquakes.<\/strong><\/h2>\n
For explanations for each map, please go to the earthquake report page for that map.<\/p>\n
- 2015.02.27 M 7.1 Indonesia<\/a><\/li>\n
- Region<\/a><\/li>\n
- 2017 Earthquake Summary Page<\/a><\/li>\n<\/ul>\n<\/ul>\n
- 2016 Earthquake Summary Page<\/a><\/li>\n
- 2016 Earthquake Summary Page<\/a><\/li>\n
![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150530_izu_bonin\/20150530_isu_bonin_interpretation.jpg\")
<\/a><\/p>\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150530_izu_bonin\/20150530_isu_bonin_aftershocks_interpretation.jpg\")
<\/a>\n<\/ul>\n![\"\"](\"http:\/\/earthjay.com\/earthquakes\/20150617_MAR\/20150617_MAR_interpretation.jpg\")
<\/a><\/p>\n