Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 02-08-2021 and time 10:20:55 (Italy) in region 5 km W Amatrice (RI)

A magnitude ML 1.5 earthquake occured in region: 5 km W Amatrice (RI), on

  • 02-08-2021 08:20:55 (UTC)
  • 02-08-2021 10:20:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6210, 13.2300 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
Amatrice RI 5 2657 2657
Cittareale RI 6 482 3139
Accumoli RI 9 667 3806
Montereale AQ 11 2581 6387
Capitignano AQ 13 665 7052
Campotosto AQ 14 542 7594
Borbona RI 14 617 8211
Posta RI 15 694 8905
Cagnano Amiterno AQ 18 1369 10274
Arquata del Tronto AP 18 1178 11452
Barete AQ 19 737 12189

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of L'Aquila (69753 inhabitants)
39 Km W of Teramo (54892 inhabitants)
48 Km E of Terni (111501 inhabitants)
57 Km SE of Foligno (57155 inhabitants)
76 Km W of Montesilvano (53738 inhabitants)
80 Km NE of Guidonia Montecelio (88673 inhabitants)
81 Km NE of Tivoli (56533 inhabitants)
83 Km W of Pescara (121014 inhabitants)
83 Km W of Chieti (51815 inhabitants)
87 Km SE of Perugia (166134 inhabitants)
95 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 2021-08-02
08:20:55		 42.6208 13.2298 12 2021-12-29
11:12:27		 Bollettino Sismico Italiano INGV 95189431
Reviewed
Rev100 		ML 1.5 2021-08-02
08:20:55		 42.6353 13.2202 9 2021-08-02
08:27:52		 Sala Sismica INGV-Roma 93552001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-02 08:20:55 ± 0.08
Latitude 42.6208 ± 0.0036
Longitude 13.2298 ± 0.0061
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 95189431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 423
Semi-minor axis of confidence ellipse (meter) 218
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 314
Circular confidence region, given by single value of horizontal uncertainty (meter) 420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 77
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.47124
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 95189431
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-08 08:31:32

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 93552001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-02 08:27:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-08-02T08:21:11.79 0.3 undecidable manual S 358 52.3032 91 0.34 65
IV.FDMO.HHZ. 2021-08-02T08:21:10.47 0.1 undecidable manual S 346 47.5191 91 0.29 89
IV.MC2.EHZ. 2021-08-02T08:21:06.84 0.1 undecidable manual S 354 32.4453 91 0.7 81
IV.SAP2.EHZ. 2021-08-02T08:21:06.02 3.0 undecidable manual S -0.67 0
IV.TERO.HHN. 2021-08-02T08:21:05.24 0.3 undecidable manual S 89 30.5472 91 -0.4 68
IV.CSP1.EHZ. 2021-08-02T08:21:04.44 0.1 undecidable manual P 358 52.3032 91 -0.07 93
IV.GAVE.EHZ. 2021-08-02T08:21:04.91 0.1 undecidable manual S 286 28.5492 92 -0.19 94
IV.NRCA.HHZ. 2021-08-02T08:21:03.87 0.1 undecidable manual S 338 25.3524 92 -0.4 91
IV.FDMO.HHZ. 2021-08-02T08:21:03.64 0.1 undecidable manual P 346 47.5191 91 -0.14 92
IV.MTRA.EHZ. 2021-08-02T08:21:02.46 0.1 undecidable manual S 42 20.2686 93 -0.45 91
IV.TERO.HHN. 2021-08-02T08:21:02.08 0.6 undecidable manual P 89 30.5472 91 0.92 37
IV.LNSS.HHZ. 2021-08-02T08:21:01.63 0.1 undecidable manual S 263 15.5733 99 -0.03 99
IV.MC2.EHZ. 2021-08-02T08:21:01.44 0.1 undecidable manual P 354 32.4453 91 0 97
IV.CAMP.HHZ. 2021-08-02T08:21:01.97 0.3 undecidable manual S 123 17.3715 96 -0.17 72
IV.RM33.EHZ. 2021-08-02T08:21:01.00 0.1 undecidable manual S 186 12.4764 111 0.14 99
IV.NRCA.HHZ. 2021-08-02T08:21:00.19 0.1 undecidable manual P 338 25.3524 92 -0.18 95
IV.GAVE.EHZ. 2021-08-02T08:21:00.70 0.1 undecidable manual P 286 28.5492 92 -0.14 95
IV.SMA1.EHZ. 2021-08-02T08:21:00.06 0.1 undecidable manual S 83 8.6802 130 0.08 99
IV.CAMP.HHZ. 2021-08-02T08:20:59.12 0.3 undecidable manual P 123 17.3715 96 -0.02 74
IV.T1299.HNZ. 2021-08-02T08:20:59.14 0.3 undecidable manual S 71 4.4955 152 -0.14 75
IV.MTRA.EHZ. 2021-08-02T08:20:59.41 0.3 positive manual P 42 20.2686 93 -0.17 72
IV.SMA1.EHZ. 2021-08-02T08:20:58.18 0.3 undecidable manual P 83 8.6802 130 0.29 71
IV.RM33.EHZ. 2021-08-02T08:20:58.53 0.1 positive manual P 186 12.4764 111 0.14 99
IV.LNSS.HHZ. 2021-08-02T08:20:58.88 0.1 undecidable manual P 263 15.5733 99 0.02 100
IV.ARRO.EHZ. 2021-08-02T08:20:57.24 3.0 positive manual P -5.51 0
IV.T1299.HNZ. 2021-08-02T08:20:57.60 0.1 undecidable manual P 71 4.4955 152 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.8 0.000741 0.26 AML other m 2021-08-02T08:21:00.36
IV.SMA1.EHN. ML:1.4 0.0003525 0.24 AML other m 2021-08-02T08:21:00.38
IV.RM33.EHN. ML:1.2 0.0001645 0.36 AML other m 2021-08-02T08:21:01.39
IV.RM33.EHE. ML:1.3 0.000185 1.3 AML other m 2021-08-02T08:21:01.78
IV.MTRA.EHN. ML:1.6 0.0003 0.26 AML other m 2021-08-02T08:21:02.64
IV.MTRA.EHE. ML:1.6 0.0003155 0.86 AML other m 2021-08-02T08:21:02.34
IV.NRCA.HHE. ML:1.6 0.0002155 0.16 AML other m 2021-08-02T08:21:03.99
IV.NRCA.HHN. ML:1.4 0.0001565 0.68 AML other m 2021-08-02T08:21:04.56
IV.RM33.HNN. ML:1.2 0.00015700750000000003 0.1344 AML other m 2021-08-02T08:21:01.39
IV.MTRA.HNE. ML:1.6 0.0002987915 0.3008 AML other m 2021-08-02T08:21:03.34
IV.MTRA.HNN. ML:1.5 0.00024242635000000002 0.1408 AML other m 2021-08-02T08:21:02.51
IV.NRCA.HNN. ML:1.5 0.0001699724 0.1344 AML other m 2021-08-02T08:21:04.69
IV.NRCA.HNE. ML:1.6 0.00022021245 0.192 AML other m 2021-08-02T08:21:04.00
IV.CSP1.EHN. ML:1.5 0.00008356394 3.744 AML other m 2021-08-02T08:21:14.45
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