USGS Seismic Event Briefing - M 5.5 - 5 km ESE of Asahi, Japan
USGS Earthquake Hazards Program

M 5.5 - 5 km ESE of Asahi, Japan

Wed, 28 Oct 2026 15:07:52 GMT | Oct 28, 2026, 11:07 PM (Local) | 35.7015° N, 140.7059° E | Depth: 41.4 km
Magnitude
5.5
MWW Scale
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P

PAGER Loss Impact

GREEN ALERT · MINIMAL DAMAGE

V

Maximum Shaking (MMI)

4.8 - Moderate

T

Tsunami Bulletin

No Tsunami Threat Warning

πŸ—Ί️ USGS ShakeMap (Instrumental Intensity & Shaking)
MMI Instrumental Intensity Contours
Epicenter: 35.702°, 140.706°
Modified Mercalli Intensity (MMI) Scale Legend USGS ShakeMap Classification
I
Not Felt
II-III
Weak
IV
Light
V
Moderate
VI
Strong
VII
Very Strong
VIII
Severe
IX
Violent
X+
Extreme
Epicenter: 35.7015° N, 140.7059° E · Depth: 41.4 km
πŸ‘₯ USGS "Did You Feel It?" (DYFI) Citizen Intensity Map
29 Citizen Reports Max CDI 3.8 10 km UTM Aggregated
Dedicated citizen shaking map compiled from public DYFI questionnaires. Data is aggregated into 10 km Universal Transverse Mercator (UTM) geographic grid cells with Community Decile Intensity (CDI).
USGS (DYFI) Citizen Intensity Map · 10km UTM Grids
29 Felt Reports
10km Grid Cell Opacity: 65%
Community Decile Intensity (CDI) Scale USGS "Did You Feel It?" Standard
I
Not Felt
II-III
Weak
IV
Light
V
Moderate
VI
Strong
VII
Very Strong
VIII+
Severe
Click any grid polygon to inspect CDI value, citizen response count, and distance from epicenter.
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Impacted Cities (Divided by MMI Tabs)
All 152 cities from USGS · Sorted by highest population within each intensity tab
City / Region MMI Intensity Population (Sorted) Distance
MMI IV · Light Shaking (55 cities sorted by population)
Chiba IV 981.738 55 km
Edogawa IV 697.932 76 km
Adachi IV 682.326 82 km
Honcho IV 641.499 65 km
Koto-ku IV 523.117 80 km
Matsudo IV 497.514 73 km
Ichihara IV 268.038 58 km
Narashino IV 174.990 61 km
Urayasu IV 169.749 73 km
Sakura IV 169.059 44 km
Misato IV 141.913 77 km
Tsuchiura IV 137.825 61 km
Narita IV 130.689 36 km
Abiko IV 130.290 63 km
Toride IV 103.908 64 km
Inzai IV 103.677 52 km
Kamisu IV 95.471 21 km
Yashio IV 93.283 79 km
Yotsukaido IV 93.233 49 km
Mobara IV 86.446 48 km
Ushiku IV 84.505 59 km
Ryugasaki IV 76.055 53 km
Kandori IV 74.469 61 km
Katori IV 71.391 29 km
Kashima IV 67.001 30 km
Yachimata IV 66.430 35 km
Asahi V 63.507 5 km
Shiroi IV 61.673 59 km
Togane IV 57.560 35 km
Choshi IV 57.533 12 km
Tsukubamirai IV 51.134 67 km
Tomisato V 49.470 13 km
Sanmu IV 48.196 28 km
Ami IV 48.072 57 km
Oamishirasato IV 47.722 41 km
Hokota IV 45.910 54 km
Inashiki IV 38.853 45 km
Sosa V 34.427 13 km
Namegata IV 31.828 38 km
Ibaraki IV 31.278 70 km
Itako IV 27.373 30 km
Yokoshibahikari IV 22.271 19 km
Shisui IV 20.278 39 km
Sakae IV 19.902 44 km
Tone IV 15.035 54 km
Kujukuri IV 14.652 31 km
Miho IV 14.355 50 km
Tako IV 13.804 22 km
Chosei IV 13.656 45 km
Tonosho V 13.085 15 km
Ichinomiya IV 11.622 48 km
Shirako IV 10.280 41 km
Shibayama IV 6.916 26 km
Nagaya IV 6.664 53 km
Kozaki IV 5.663 35 km
MMI III & Under · Weak / Not Felt (92 cities sorted by population)
Tokyo IV 37.732.000 92 km
Yokohama IV 3.757.630 101 km
Kawasaki IV 1.539.522 93 km
Saitama IV 1.325.843 97 km
Setagaya IV 940.509 95 km
Nerima IV 742.463 95 km
Ota-ku IV 737.187 91 km
Kawaguchi IV 593.353 89 km
Suginami-ku IV 583.609 97 km
Itabashi IV 581.337 90 km
Utsunomiya III 518.197 120 km
Ichikawa IV 496.657 70 km
Kashiwa IV 433.941 68 km
Shinagawa-ku IV 415.729 89 km
Yokosuka III 390.275 107 km
Kita-ku IV 353.058 88 km
Shinjuku IV 349.385 91 km
Koshigaya IV 346.768 85 km
Nakano IV 341.014 94 km
Toshima IV 297.954 89 km
Meguro IV 286.905 91 km
Sumida IV 270.823 82 km
Mito IV 270.445 77 km
Minato IV 260.486 86 km
Soka IV 251.390 82 km
Tsukuba-kenkyugakuen-toshi IV 246.647 71 km
Bunkyo-ku IV 240.069 86 km
Shibuya-ku IV 235.193 91 km
Kasukabe IV 228.975 91 km
Taito IV 210.528 84 km
Nagareyama IV 200.298 74 km
Chuo-ku IV 169.995 84 km
Oyama IV 167.874 106 km
Hitachi-Naka IV 154.311 79 km
Tochigi III 153.508 116 km
Noda IV 152.227 81 km
Kukichuo IV 150.197 102 km
Toda IV 142.352 94 km
Koga IV 138.237 101 km
Kisarazu IV 136.118 80 km
Shibuya IV 102.056 90 km
Chikusei IV 99.758 94 km
Kanuma III 94.591 129 km
Kimitsu IV 81.355 84 km
Mooka IV 78.665 103 km
Warabi IV 74.996 94 km
Kasama IV 73.521 80 km
Yoshikawa IV 72.139 81 km
Ishioka IV 71.851 66 km
Moriya IV 68.992 71 km
Chiyoda-ku IV 67.036 86 km
Hasuda IV 61.473 100 km
Hatogaya-honcho IV 61.379 88 km
Shimotsuke IV 59.404 109 km
Joso IV 59.223 73 km
Naka IV 53.035 86 km
Shiraoka IV 52.103 99 km
Bando IV 51.511 83 km
Yuki IV 50.218 100 km
Satte IV 49.961 98 km
Omitama IV 48.555 68 km
Hitachi-ota IV 47.586 94 km
Inuma IV 45.065 103 km
Tateyama IV 44.692 109 km
Sugito IV 43.755 94 km
Futtsu IV 42.280 89 km
Shimotsuma IV 41.499 85 km
Kasumigaura IV 39.993 65 km
Mibu III 39.151 115 km
Hitachiomiya IV 38.836 97 km
Sakuragawa III 38.677 89 km
Tokai IV 37.700 87 km
Minami-Boso III 35.454 107 km
Minamishiro IV 34.012 96 km
Maebara IV 31.554 85 km
Kaminokawa III 30.886 109 km
Matsubushi IV 28.494 84 km
Nogi IV 24.903 105 km
Sakai IV 24.035 94 km
Mashiko III 21.621 101 km
Yachiyo IV 20.838 91 km
Shirosato IV 17.916 91 km
Katsuura IV 16.723 71 km
Oarai IV 15.696 69 km
Haga III 14.833 111 km
Motegi III 11.631 103 km
Ichikai III 11.205 108 km
Otaki IV 8.762 62 km
Chonan IV 7.368 55 km
Shinmachi IV 6.769 65 km
Nishiowa IV 6.731 101 km
Nishizawa III 6.593 121 km
Click any MMI tab above to isolate intensity levels Total: 152 USGS Monitored Cities
πŸ›️ Regional Earthquakes Archive Prioritized by Magnitude
Major historical shocks (M6.0+ & M7.0+ up to 300 km) and significant regional events
Regional earthquakes prioritized by highest magnitude (major past ruptures and strong historical analogs). Click any row (▾ Map) to reveal an interactive satellite location map with distance comparison to the mainshock epicenter.
SORT:
MAG Date & Time (UTC) Location Depth
8.0 Sep 1, 1923 02:58 AM 5 km SSE of ?iso, Japan 15.0 km
7.9 Mar 11, 2011 06:15 AM 47 km E of ?arai, Japan 42.6 km
7.9 Nov 25, 1953 05:48 PM 174 km SE of Katsuura, Japan 25.0 km
7.8 Nov 5, 1938 08:43 AM 105 km E of Iwaki, Japan 35.0 km
7.8 Sep 2, 1923 02:46 AM 5 km E of Tateyama, Japan 15.0 km
7.7 Nov 6, 1938 08:53 AM 116 km E of Namie, Japan 30.0 km
7.7 Nov 5, 1938 10:50 AM 116 km ESE of Namie, Japan 35.0 km
7.7 May 23, 1938 07:18 AM 69 km ESE of Kitaibaraki, Japan 15.0 km
7.6 Nov 6, 1938 09:38 PM 141 km ESE of Namie, Japan 25.0 km
7.4 Jan 21, 1906 01:49 PM 50 km SSW of Ōyama, Japan 300.0 km
7.3 Mar 16, 2022 02:36 PM 57 km ENE of Namie, Japan 41.0 km
7.3 Dec 4, 1972 10:16 AM 206 km SSE of Wada, Japan 25.9 km
7.3 Sep 7, 1906 06:52 PM 190 km SE of Hasaki, Japan 15.0 km
7.2 Feb 29, 1972 09:23 AM 193 km SSE of Wada, Japan 46.4 km
7.2 Jan 16, 1961 07:20 AM 93 km ENE of Hasaki, Japan 30.0 km
7.2 Jun 1, 1923 05:24 PM 64 km ENE of Hasaki, Japan 15.0 km
7.2 Oct 24, 1905 03:46 AM 38 km SSW of Shimoda, Japan 15.0 km
7.1 Feb 13, 2021 02:07 PM 73 km ENE of Namie, Japan 44.0 km
7.1 Apr 7, 2011 02:32 PM 29 km ESE of Ishinomaki, Japan 42.0 km
7.1 Jul 23, 1982 02:23 PM 93 km ENE of Hasaki, Japan 36.6 km
7.1 Apr 11, 1943 02:46 PM 96 km ESE of Takahagi, Japan 15.0 km
7.1 Nov 13, 1938 10:31 PM 200 km ESE of Iwaki, Japan 35.0 km
7.1 Aug 14, 1924 06:02 PM 67 km ENE of Kashima-shi, Japan 15.0 km
7.1 Mar 13, 1909 02:28 PM 150 km ESE of Hasaki, Japan 15.0 km
7.0 Jul 19, 2008 02:39 AM 107 km E of Namie, Japan 22.0 km
7.0 Oct 31, 2003 01:06 AM 133 km ESE of Ishinomaki, Japan 10.0 km
7.0 Sep 17, 1965 04:21 PM 73 km E of Ōarai, Japan 41.1 km
7.0 Jan 16, 1961 12:12 PM 104 km ENE of Hasaki, Japan 30.0 km
7.0 Jan 22, 1959 05:10 AM 117 km E of Namie, Japan 35.0 km
7.0 Nov 30, 1938 02:29 AM 99 km E of Iwaki, Japan 30.0 km
7.0 Aug 18, 1927 07:27 PM 125 km ESE of Katsuura, Japan 20.0 km
7.0 Aug 5, 1927 09:12 PM 114 km E of Namie, Japan 35.0 km
7.0 Jan 14, 1924 08:50 PM 3 km NE of Sayama, Japan 15.0 km
7.0 Apr 21, 1916 11:31 AM 208 km SE of Katsuura, Japan 15.0 km
7.0 Mar 12, 1909 11:18 PM 82 km ENE of Hasaki, Japan 15.0 km
6.9 May 1, 2021 01:27 AM 30 km SSE of Onagawa Ch?, Japan 43.0 km
6.9 Nov 21, 2016 08:59 PM 35 km ESE of Namie, Japan 9.0 km
6.9 May 7, 2008 04:45 PM 78 km NE of Hasaki, Japan 27.0 km
6.9 Jul 19, 1944 10:21 AM off the east coast of Honshu, Japan 15.0 km
6.9 Nov 9, 1938 09:15 AM 174 km ESE of Iwaki, Japan 15.0 km
6.9 Nov 25, 1930 07:02 PM 5 km WSW of Atami, Japan 15.0 km
6.8 Feb 6, 1987 01:16 PM 72 km E of Iwaki, Japan 47.7 km
6.8 Sep 18, 1984 05:02 PM 166 km SE of Katsuura, Japan 47.6 km
6.8 Nov 15, 1942 05:12 PM 76 km E of ?arai, Japan 15.0 km
6.8 Nov 22, 1938 01:14 AM 155 km ESE of Iwaki, Japan 25.0 km
6.8 Nov 7, 1938 01:38 AM 130 km ESE of Namie, Japan 30.0 km
6.8 Jul 19, 1935 12:49 AM 80 km ESE of Kitaibaraki, Japan 10.0 km
6.8 Sep 26, 1923 08:23 AM 21 km SE of Shimoda, Japan 10.0 km
6.8 Jan 15, 1908 12:57 PM 70 km E of Namie, Japan 35.0 km
6.7 Feb 16, 1996 03:22 PM 123 km E of Namie, Japan 40.8 km
6.7 Dec 17, 1987 02:08 AM 10 km SW of Mobara, Japan 62.9 km
6.7 Apr 22, 1987 08:13 PM 62 km E of Iwaki, Japan 30.3 km
6.7 Apr 7, 1987 12:40 AM 71 km E of Namie, Japan 29.4 km
6.7 Jan 16, 1961 03:41 PM 96 km ENE of Hasaki, Japan 30.0 km
6.7 Nov 26, 1953 08:14 AM 143 km SE of Katsuura, Japan 25.0 km
6.7 Mar 11, 1945 09:37 PM 118 km ENE of Namie, Japan 45.0 km
6.7 Sep 21, 1938 06:51 PM 60 km ESE of Takahagi, Japan 15.0 km
6.7 Sep 2, 1923 09:26 AM 9 km SSE of Mobara, Japan 35.0 km
6.7 Sep 1, 1923 07:38 AM 8 km S of Ninomiya, Japan 15.0 km
6.7 Jun 1, 1923 08:15 PM 60 km ENE of Hasaki, Japan 35.0 km
6.7 Sep 15, 1916 07:01 AM 136 km SSE of Katsuura, Japan 35.0 km
6.6 Apr 11, 2011 08:16 AM 17 km SSW of Ishikawa, Japan 11.0 km
6.6 Mar 11, 2011 06:18 AM 133 km ENE of Hasaki, Japan 16.0 km
6.6 Jul 16, 2007 01:13 AM 20 km NNW of Kashiwazaki, Japan 12.0 km
6.6 Jan 19, 2005 06:11 AM 161 km SE of Katsuura, Japan 27.8 km
6.6 Oct 23, 2004 08:56 AM 8 km SSW of Ojiya, Japan 16.0 km
6.6 Jun 24, 1986 02:53 AM 46 km SSE of Katsuura, Japan 62.6 km
6.6 Jan 14, 1978 03:24 AM 23 km SE of It?, Japan 14.0 km
6.6 Feb 21, 1942 07:07 AM 76 km ENE of Namie, Japan 35.0 km
6.6 Mar 30, 1935 09:19 PM 84 km ESE of Namie, Japan 35.0 km
6.6 Aug 25, 1924 02:31 PM 98 km ESE of Kitaibaraki, Japan 25.0 km
6.6 Apr 8, 1906 05:37 PM 132 km ESE of Iwaki, Japan 35.0 km
6.5 Mar 11, 2011 08:19 AM 81 km NE of Hasaki, Japan 6.8 km
6.5 Mar 11, 2011 06:20 AM 115 km ENE of Hasaki, Japan 49.3 km
6.5 May 8, 1974 11:33 PM 25 km SW of Shimoda, Japan 2.0 km
6.5 Sep 22, 1965 10:08 PM 69 km ESE of Takahagi, Japan 40.1 km
6.5 Aug 15, 1963 06:11 AM 82 km ENE of Namie, Japan 35.0 km
6.5 Oct 26, 1959 07:35 AM 177 km E of Namie, Japan 20.0 km
6.5 Nov 26, 1953 12:03 AM 137 km SE of Katsuura, Japan 25.0 km
6.5 Aug 7, 1948 02:40 PM 138 km SE of Hasaki, Japan 15.0 km
6.5 Nov 7, 1938 07:33 PM 156 km ESE of Iwaki, Japan 30.0 km
6.5 Sep 21, 1931 02:20 AM 1 km WNW of Kumagaya, Japan 15.0 km
6.5 Jun 23, 1931 06:14 AM 97 km NE of Hasaki, Japan 25.0 km
6.5 Aug 23, 1927 06:29 AM 171 km SE of Hasaki, Japan 15.0 km
6.5 Aug 3, 1919 06:08 PM 101 km SE of Hasaki, Japan 15.0 km
6.5 Nov 8, 1911 02:11 PM 53 km ESE of Hasaki, Japan 15.0 km
6.4 Mar 11, 2011 06:07 AM 108 km ESE of Kitaibaraki, Japan 32.3 km
6.4 Apr 12, 1943 07:43 PM 88 km ENE of Hasaki, Japan 25.0 km
6.4 Dec 8, 1921 12:31 PM 6 km NNW of Narita, Japan 60.0 km
6.3 Jul 30, 2011 06:53 PM 13 km SSE of Iwaki, Japan 38.0 km
6.3 Mar 11, 2011 03:13 PM 92 km ENE of Hasaki, Japan 21.0 km
6.3 Mar 11, 2011 07:14 AM near the east coast of Honshu, Japan 24.7 km
6.3 Oct 19, 2005 11:44 AM 25 km ENE of ?arai, Japan 32.0 km
6.3 Jun 1, 1990 01:22 AM near the east coast of Honshu, Japan 67.0 km
6.3 May 30, 1964 02:30 PM 67 km ENE of Kashima-shi, Japan 47.6 km
6.3 May 8, 1963 10:22 AM 50 km E of ?arai, Japan 46.5 km
6.3 Jan 16, 1961 02:03 PM 128 km ENE of Hasaki, Japan 30.0 km
6.3 Jan 16, 1961 11:19 AM 79 km ENE of Hasaki, Japan 30.0 km
6.3 Sep 29, 1956 11:20 PM 4 km S of Shisui, Japan 66.1 km
6.3 Jul 18, 1954 09:07 AM 12 km SSE of Hasaki, Japan 55.0 km
6.3 Apr 4, 1953 05:52 AM 64 km ENE of Hasaki, Japan 28.4 km
6.3 Dec 25, 1949 11:24 PM 2 km ESE of Imaichi, Japan 10.0 km
6.3 Dec 25, 1949 11:17 PM 3 km ENE of Imaichi, Japan 10.0 km
6.3 Oct 28, 1948 08:45 PM 46 km E of ?arai, Japan 35.0 km
6.3 Mar 14, 1943 12:42 PM 98 km ESE of Takahagi, Japan 15.0 km
6.3 Dec 6, 1937 04:34 AM 120 km E of Hasaki, Japan 15.0 km
6.3 Oct 17, 1937 04:47 AM 44 km ESE of Hasaki, Japan 25.0 km
6.3 Aug 17, 1924 01:45 AM 129 km E of Hasaki, Japan 10.0 km
6.3 May 31, 1924 12:02 PM 5 km NNE of Omigawa, Japan 35.0 km
6.3 Dec 27, 1923 02:39 PM 92 km ENE of Hasaki, Japan 35.0 km
6.3 Apr 26, 1922 01:11 AM 9 km W of Kawasaki, Japan 35.0 km
6.3 Feb 24, 1906 12:13 AM 116 km ESE of Katsuura, Japan 15.0 km
6.2 Apr 21, 2011 01:37 PM 6 km WNW of T?gane, Japan 43.0 km
6.2 Apr 11, 2011 11:08 PM 23 km SE of T?gane, Japan 15.0 km
6.2 Mar 11, 2011 08:12 AM 70 km ESE of Kitaibaraki, Japan 39.6 km
6.2 May 7, 2008 04:02 PM 80 km NE of Hasaki, Japan 19.0 km
6.2 Jun 3, 2000 08:54 AM 6 km SE of Narut?, Japan 62.3 km
6.2 Sep 11, 1996 02:37 AM 23 km SSE of Hasaki, Japan 55.0 km
6.2 Feb 12, 1986 02:59 AM 49 km ESE of Hitachi, Japan 30.0 km
6.2 Jul 23, 1982 05:54 PM 88 km ENE of Hasaki, Japan 31.0 km
6.2 May 19, 1968 04:12 AM 99 km E of Hasaki, Japan 29.9 km
6.2 Feb 5, 1964 11:30 AM 48 km E of Ōarai, Japan 50.2 km
6.2 Feb 26, 1949 04:01 AM 117 km E of Hasaki, Japan 25.0 km
6.2 Nov 25, 1941 03:20 PM 82 km ESE of Takahagi, Japan 25.0 km
6.2 May 9, 1941 09:32 AM 110 km ESE of Takahagi, Japan 25.0 km
6.2 Jun 12, 1940 01:59 PM near the east coast of Honshu, Japan 15.0 km
6.2 Oct 29, 1938 01:08 PM 51 km SE of Hasaki, Japan 15.0 km
6.2 Dec 10, 1937 01:28 PM 106 km ESE of Hasaki, Japan 15.0 km
6.2 May 1, 1930 12:57 AM 31 km SE of Hasaki, Japan 35.0 km
6.2 Jul 26, 1929 10:48 PM 2 km SSE of Zama, Japan 60.0 km
6.2 Jul 25, 1918 08:50 PM 126 km E of Hasaki, Japan 15.0 km
Seismic Origin Parameters
Event ID us7000ttpe
Magnitude 5.5 MWW
Origin Time (UTC) Wed, 28 Oct 2026 15:07:52 GMT
Latitude 35.7015°
Longitude 140.7059°
Hypocenter Depth 41.4 km
Review Status REVIEWED
Significance Index 476 / 1000
Ground Motion & Felt Intensity
Max MMI Intensity 4.8 (V)
Perceived Shaking Moderate
Peak Ground Accel (PGA) 0.092 g
Peak Ground Vel (PGV) 4.2 cm/s
PSA (0.3 s) 0.147 g
PSA (1.0 s) 0.041 g
DYFI Felt Reports 29 responses
Community CDI 3.8
Focal Mechanism & Fault Geometry Thrust / Reverse Faulting
Nodal Plane 1 Strike 14.36° · Dip 66.66° · Rake 89.9°
Nodal Plane 2 Strike 194.6° · Dip 23.34° · Rake 90.22°
Scalar Moment (M₀) 1.89E+17 N·m
Fault Kinematics Thrust / Reverse Faulting
Lower-Hemisphere Focal Projection
Seismic Network & Solution Quality
STATIONS USED
116
PHASES USED
117
AZIMUTHAL GAP
64°
DEPTH ERROR
± 6.2 km

Data provided by the U.S. Geological Survey (USGS) Earthquake Hazards Program.

Official USGS Event Page (us7000ttpe)