Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 21-07-2020 and time 00:28:31 (UTC) in region 3 km N Accumoli (RI)

A magnitude ML 1.5 earthquake occured in region: 3 km N Accumoli (RI), on

  • 21-07-2020 00:28:31 (UTC)
  • 21-07-2020 02:28:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7180, 13.2480 at 12 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Accumoli RI 3 667 667
Arquata del Tronto AP 7 1178 1845
Amatrice RI 10 2657 4502
Cittareale RI 13 482 4984
Acquasanta Terme AP 14 2916 7900
Norcia PG 15 4957 12857
Montegallo AP 16 523 13380
Cascia PG 19 3217 16597

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km W of Teramo (54892 inhabitants)
43 Km N of L'Aquila (69753 inhabitants)
52 Km SE of Foligno (57155 inhabitants)
52 Km E of Terni (111501 inhabitants)
77 Km W of Montesilvano (53738 inhabitants)
82 Km SE of Perugia (166134 inhabitants)
84 Km W of Pescara (121014 inhabitants)
86 Km W of Chieti (51815 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km NE of Tivoli (56533 inhabitants)
99 Km E of Viterbo (67173 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.5 2020-07-21
00:28:31		 42.7183 13.248 12 2020-11-19
12:37:00		 Bollettino Sismico Italiano INGV 82711941
Reviewed
Rev100 		ML 1.6 2020-07-21
00:28:31		 42.725 13.247 12 2020-07-21
00:35:05		 Sala Sismica INGV-Roma 81204441
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-21 00:28:31 ± 0.05
Latitude 42.7183 ± 0.0027
Longitude 13.2480 ± 0.0037
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 82711941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 350
Semi-minor axis of confidence ellipse (meter) 129
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 238
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 41
Number of associated phases, regardless of their use for origin computation 44
Number of defining phases 42
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.81029
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 30
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 82711941
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-07 12:38:34

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 81204441
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-21 00:35:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSFR.HHZ. 2020-07-21T00:28:46.66 0.3 undecidable manual P 335 88.1451 91 0.17 64
IV.ARVD.HHZ. 2020-07-21T00:28:46.98 0.3 undecidable manual P 344 89.9433 91 0.2 63
MN.AQU.HNZ. 2020-07-21T00:28:45.30 0.6 undecidable manual S 162 42.4242 92 0.03 47
IV.GIGS.HHZ. 2020-07-21T00:28:44.10 0.3 undecidable manual S 138 39.627 92 -0.42 66
IV.EL6.EHZ. 2020-07-21T00:28:43.36 0.3 undecidable manual P 350 68.7756 91 -0.15 66
IV.T0110.HHE. 2020-07-21T00:28:43.61 0.6 undecidable manual P 141 69.375 91 0.01 45
IV.VCEL.EHE. 2020-07-21T00:28:42.42 0.3 undecidable manual P 126 60.2952 91 0.22 66
IV.ASSB.HHZ. 2020-07-21T00:28:42.04 0.3 undecidable manual P 307 59.8956 91 -0.1 68
IV.TERO.HHZ. 2020-07-21T00:28:41.80 0.3 undecidable manual S 110 30.9468 94 -0.4 67
IV.CESX.HHZ. 2020-07-21T00:28:41.55 0.6 undecidable manual P 257 55.3002 92 0.12 45
IV.GAVE.EHZ. 2020-07-21T00:28:41.70 0.3 undecidable manual S 264 28.9488 94 0.01 73
IV.MNTP.HNZ. 2020-07-21T00:28:41.25 0.6 undecidable manual P 21 49.8168 92 0.66 40
IV.MOMA.HHZ. 2020-07-21T00:28:41.64 0.3 undecidable manual P 280 55.9995 91 0.1 68
IV.OFFI.HHZ. 2020-07-21T00:28:40.26 0.3 undecidable manual P 56 42.9237 92 0.73 59
IV.RM33.EHZ. 2020-07-21T00:28:40.40 0.3 undecidable manual S 187 23.3544 96 0.2 71
IV.MNTT.EHZ. 2020-07-21T00:28:40.97 0.3 undecidable manual P 36 47.4192 92 0.75 58
IV.SAP2.EHE. 2020-07-21T00:28:40.07 0.3 undecidable manual P 16 43.7229 92 0.42 66
IV.FIAM.HHZ. 2020-07-21T00:28:40.62 0.3 undecidable manual P 192 51.1155 92 -0.16 68
IV.CAMP.HHZ. 2020-07-21T00:28:40.10 0.3 undecidable manual S 147 24.1536 96 -0.3 69
IV.CSP1.EHZ. 2020-07-21T00:28:39.08 0.1 undecidable manual P 355 41.625 92 -0.24 91
IV.ARRO.EHZ. 2020-07-21T00:28:39.50 0.3 undecidable manual P 249 42.2244 92 0.08 71
IV.LNSS.HHZ. 2020-07-21T00:28:39.80 0.3 undecidable manual S 233 21.2676 98 0.17 72
IV.GUMA.HHZ. 2020-07-21T00:28:39.00 0.3 undecidable manual P 10 38.8278 92 0.1 71
MN.AQU.HNZ. 2020-07-21T00:28:39.36 0.3 undecidable manual P 162 42.4242 92 -0.08 70
IV.CESI.HHE. 2020-07-21T00:28:39.27 0.1 undecidable manual P 319 42.3243 92 -0.16 92
IV.MC2.EHZ. 2020-07-21T00:28:39.70 0.3 undecidable manual S 347 21.9669 97 -0.12 72
IT.MTCL.HGZ. 2020-07-21T00:28:38.24 0.1 undecidable manual P 327 36.6411 93 -0.32 90
IV.NRCA.HNZ. 2020-07-21T00:28:38.00 0.3 undecidable manual S 320 16.7721 104 -0.47 68
IV.MF5.EHZ. 2020-07-21T00:28:38.33 3.0 undecidable manual P 0.1 0
IV.GIGS.HHZ. 2020-07-21T00:28:38.74 0.3 undecidable manual P 138 39.627 92 -0.27 68
IV.MTRA.HNZ. 2020-07-21T00:28:37.20 0.3 undecidable manual S 71 12.876 116 -0.27 71
IV.GAVE.EHZ. 2020-07-21T00:28:37.30 0.1 undecidable manual P 264 28.9488 94 -0.08 96
IV.T1299.EHE. 2020-07-21T00:28:37.10 0.3 undecidable manual S 163 9.7791 129 0.33 71
IV.SMA1.EHZ. 2020-07-21T00:28:37.20 0.3 undecidable manual S 144 12.0768 119 -0.09 74
IV.TERO.HHZ. 2020-07-21T00:28:37.44 0.1 undecidable manual P 110 30.9468 94 -0.23 93
IV.LNSS.HHZ. 2020-07-21T00:28:36.26 0.1 undecidable manual P 233 21.2676 98 0.07 98
IV.CAMP.HHZ. 2020-07-21T00:28:36.61 0.1 undecidable manual P 147 24.1536 96 -0.02 98
IV.MC2.EHZ. 2020-07-21T00:28:36.23 0.1 undecidable manual P 347 21.9669 97 -0.07 97
IV.RM33.EHZ. 2020-07-21T00:28:36.57 0.1 undecidable manual P 187 23.3544 96 0.05 98
IV.NRCA.HNZ. 2020-07-21T00:28:35.40 0.1 undecidable manual P 320 16.7721 104 -0.12 97
IV.MMO1.EHZ. 2020-07-21T00:28:35.91 3.0 undecidable manual P -0.21 0
IV.MTRA.HNZ. 2020-07-21T00:28:34.94 0.1 undecidable manual P 71 12.876 116 0 100
IV.T1299.EHE. 2020-07-21T00:28:34.87 0.3 undecidable manual P 163 9.7791 129 0.33 71
IV.SMA1.EHZ. 2020-07-21T00:28:34.99 0.1 undecidable manual P 144 12.0768 119 0.15 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.HNN. ML:1.7 0.000499 0.16 AML other m 2020-07-21T00:28:37.29
IV.MTRA.EHN. ML:1.7 0.0005110000000000001 0.16 AML other m 2020-07-21T00:28:37.29
IV.SMA1.EHE. ML:1.8 0.0006725 0.34 AML other m 2020-07-21T00:28:37.59
IV.SMA1.EHN. ML:1.8 0.0006454999999999999 0.1 AML other m 2020-07-21T00:28:37.74
IV.MTRA.HNE. ML:1.7 0.00044899999999999996 0.46 AML other m 2020-07-21T00:28:37.98
IV.MTRA.EHE. ML:1.7 0.0004525 0.46 AML other m 2020-07-21T00:28:37.99
IV.NRCA.HHE. ML:2.2 0.0012749999999999999 0.16 AML other m 2020-07-21T00:28:38.29
IV.NRCA.HNE. ML:2.2 0.0011600000000000002 0.18 AML other m 2020-07-21T00:28:38.29
IV.NRCA.HNN. ML:1.9 0.000735 0.14 AML other m 2020-07-21T00:28:38.70
IV.NRCA.HHN. ML:2.0 0.0007989999999999999 0.14 AML other m 2020-07-21T00:28:38.70
IV.LNSS.HHN. ML:1.9 0.000484 1.8 AML other m 2020-07-21T00:28:39.02
IV.LNSS.HHE. ML:1.7 0.0003155 0.42 AML other m 2020-07-21T00:28:40.09
IV.CAMP.HHE. ML:1.4 0.0001635 0.16 AML other m 2020-07-21T00:28:40.50
IV.CAMP.HHN. ML:1.3 0.0001265 0.64 AML other m 2020-07-21T00:28:40.93
IV.RM33.EHN. ML:1.4 0.00015200000000000004 0.44 AML other m 2020-07-21T00:28:41.67
IV.TERO.HHE. ML:1.3 0.00010205 1.24 AML other m 2020-07-21T00:28:42.72
IV.RM33.EHE. ML:1.3 0.000123 0.32 AML other m 2020-07-21T00:28:42.35
IV.GAVE.EHN. ML:1.5 0.0001715 1.06 AML other m 2020-07-21T00:28:42.03
IV.GAVE.EHE. ML:1.5 0.00014749999999999998 0.64 AML other m 2020-07-21T00:28:42.92
IV.TERO.HHN. ML:1.6 0.000158 0.08 AML other m 2020-07-21T00:28:42.59
IV.MF5.EHN. ML:1.6 0.0001645 0.46 AML other m 2020-07-21T00:28:44.14
IV.MF5.EHE. ML:1.4 0.00009769999999999999 1.38 AML other m 2020-07-21T00:28:44.11
IV.GUMA.HHE. ML:1.7 0.00016350000000000002 0.22 AML other m 2020-07-21T00:28:45.26
IV.GUMA.HHN. ML:1.7 0.00016350000000000002 0.16 AML other m 2020-07-21T00:28:45.30
IV.ARRO.EHN. ML:1.3 0.00006759999999999999 0.94 AML other m 2020-07-21T00:28:46.49
IV.ARRO.EHE. ML:1.3 0.00006185 0.24 AML other m 2020-07-21T00:28:47.20
IV.OFFI.HHN. ML:2.0 0.0002855 1.34 AML other m 2020-07-21T00:28:47.17
IV.OFFI.HHE. ML:1.8 0.000182 1.22 AML other m 2020-07-21T00:28:48.75
IV.MNTT.EHN. ML:1.8 0.0001585 0.14 AML other m 2020-07-21T00:28:49.44
IV.CESX.HHE. ML:1.0 0.0000273 0.7 AML other m 2020-07-21T00:28:49.46
IV.CESX.HHN. ML:1.0 0.00002575 0.62 AML other m 2020-07-21T00:28:49.47
IV.MOMA.HHE. ML:1.3 0.00004405 1.8 AML other m 2020-07-21T00:28:50.98
IV.MOMA.HHN. ML:1.1 0.00003205 0.54 AML other m 2020-07-21T00:28:51.31
IV.MNTT.EHE. ML:1.6 0.0001215 0.56 AML other m 2020-07-21T00:28:51.40
IV.ASSB.HHE. ML:1.3 0.000046649999999999996 0.22 AML other m 2020-07-21T00:28:51.66
IV.ASSB.HHN. ML:1.2 0.000027799999999999998 0.48 AML other m 2020-07-21T00:28:53.45
IV.ARVD.HHN. ML:0.9 0.000008295000000000001 1.54 AML other m 2020-07-21T00:28:59.93
IV.SSFR.HHE. ML:1.5 0.00003485 0.22 AML other m 2020-07-21T00:28:59.38
IV.SSFR.HHN. ML:1.6 0.0000426 0.2 AML other m 2020-07-21T00:28:59.23
IV.ARVD.HHE. ML:0.9 0.0000115 0.22 AML other m 2020-07-21T00:29:00.45
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download