Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 21-07-2021 and time 14:56:02 (UTC) in region 4 km N Amatrice (RI)

A magnitude ML 1.3 earthquake occured in region: 4 km N Amatrice (RI), on

  • 21-07-2021 14:56:02 (UTC)
  • 21-07-2021 16:56:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6680, 13.3040 at 13 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 4 2657 2657
Accumoli RI 6 667 3324
Arquata del Tronto AP 12 1178 4502
Cittareale RI 13 482 4984
Campotosto AQ 13 542 5526
Acquasanta Terme AP 14 2916 8442
Capitignano AQ 16 665 9107
Montereale AQ 17 2581 11688
Cortino TE 18 656 12344
Valle Castellana TE 18 977 13321
Rocca Santa Maria TE 18 537 13858
Montegallo AP 20 523 14381
Crognaleto TE 20 1297 15678

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km W of Teramo (54892 inhabitants)
36 Km N of L'Aquila (69753 inhabitants)
55 Km E of Terni (111501 inhabitants)
59 Km SE of Foligno (57155 inhabitants)
71 Km W of Montesilvano (53738 inhabitants)
78 Km W of Pescara (121014 inhabitants)
79 Km W of Chieti (51815 inhabitants)
88 Km NE of Guidonia Montecelio (88673 inhabitants)
89 Km NE of Tivoli (56533 inhabitants)
89 Km SE of Perugia (166134 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 1.3 2021-07-21
14:56:02		 42.668 13.3037 13 2021-12-29
11:12:20		 Bollettino Sismico Italiano INGV 94066001
Reviewed
Rev100 		ML 1.3 2021-07-21
14:56:02		 42.667 13.3043 13 2021-07-21
15:05:04		 Sala Sismica INGV-Roma 93019401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-21 14:56:02 ± 0.09
Latitude 42.6680 ± 0.0036
Longitude 13.3037 ± 0.0073
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94066001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 436
Semi-minor axis of confidence ellipse (meter) 358
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 260
Circular confidence region, given by single value of horizontal uncertainty (meter) 440.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 63
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.03687
Epicentral distance of station farthest from the epicenter (degree) 0.42988
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 94066001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-08-13 07:15:08

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 93019401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-21 15:05:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-07-21T14:56:18.02 0.3 undecidable manual S 350 47.7189 93 0.49 64
IV.GAVE.EHZ. 2021-07-21T14:56:13.51 0.6 undecidable manual S 275 33.5442 95 -0.24 46
IV.MC2.EHZ. 2021-07-21T14:56:12.56 0.6 undecidable manual S 341 28.5492 97 0.12 48
IV.TERO.HHZ. 2021-07-21T14:56:11.27 0.6 undecidable manual S 101 25.0527 99 -0.23 47
IV.CSP1.EHZ. 2021-07-21T14:56:11.26 0.6 negative manual P 350 47.7189 93 0.16 46
IV.NRCA.HHZ. 2021-07-21T14:56:10.82 0.6 undecidable manual S 320 23.9538 99 -0.41 45
IV.RM33.EHZ. 2021-07-21T14:56:09.86 0.3 undecidable manual S 202 19.0698 105 -0.09 72
IV.MC2.EHZ. 2021-07-21T14:56:08.17 0.1 undecidable manual P 341 28.5492 97 0 97
IV.GAVE.EHZ. 2021-07-21T14:56:08.84 0.6 negative manual P 275 33.5442 95 -0.08 47
IV.NRCA.HHZ. 2021-07-21T14:56:07.37 0.3 undecidable manual P 320 23.9538 99 -0.1 72
IV.TERO.HHZ. 2021-07-21T14:56:07.57 0.1 negative manual P 101 25.0527 99 -0.05 97
IV.LNSS.HHZ. 2021-07-21T14:56:07.29 0.1 undecidable manual P 252 22.6551 101 0.02 98
IV.MTRA.HNZ. 2021-07-21T14:56:07.94 0.3 undecidable manual S 38 12.3765 122 -0.37 70
IV.T1299.EHZ. 2021-07-21T14:56:06.94 0.3 undecidable manual S 205 4.0959 158 0.06 75
IV.RM33.EHZ. 2021-07-21T14:56:06.81 0.3 positive manual P 202 19.0698 105 0.08 74
IV.SMA1.EHZ. 2021-07-21T14:56:06.79 0.6 undecidable manual S 148 4.8951 154 -0.17 49
IV.MTRA.HNZ. 2021-07-21T14:56:05.76 0.1 undecidable manual P 38 12.3765 122 -0.02 100
IV.T1299.EHZ. 2021-07-21T14:56:05.28 0.1 undecidable manual P 205 4.0959 158 0.33 95
IV.SMA1.EHZ. 2021-07-21T14:56:05.13 0.1 undecidable manual P 148 4.8951 154 0.13 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.5 0.0004145 1.7 AML other m 2021-07-21T14:56:06.87
IV.SMA1.EHE. ML:1.4 0.000333 1.72 AML other m 2021-07-21T14:56:06.09
IV.MTRA.EHN. ML:1.5 0.000314 0.54 AML other m 2021-07-21T14:56:08.31
IV.MTRA.EHE. ML:1.5 0.0002835 1.26 AML other m 2021-07-21T14:56:08.96
IV.RM33.EHN. ML:1.1 0.00009204999999999999 0.62 AML other m 2021-07-21T14:56:10.12
IV.RM33.EHE. ML:1.1 0.0000962 0.28 AML other m 2021-07-21T14:56:10.39
IV.LNSS.HHN. ML:1.0 0.00006544999999999999 0.26 AML other m 2021-07-21T14:56:11.11
IV.TERO.HHN. ML:1.2 0.00008010000000000001 0.24 AML other m 2021-07-21T14:56:11.40
IV.NRCA.HHE. ML:1.5 0.0001805 1.02 AML other m 2021-07-21T14:56:11.65
IV.LNSS.HHE. ML:1.1 0.00008065 0.14 AML other m 2021-07-21T14:56:12.52
IV.NRCA.HHN. ML:1.2 0.00009265 1.34 AML other m 2021-07-21T14:56:13.01
IV.GAVE.EHN. ML:1.1 0.00005255 1.52 AML other m 2021-07-21T14:56:14.13
IV.GAVE.EHE. ML:1.2 0.00006305 0.84 AML other m 2021-07-21T14:56:15.39
IV.TERO.HHE. ML:1.4 0.0001419117 0.3456 AML other m 2021-07-21T14:56:11.53
IV.GAVE.HNE. ML:1.5 0.00013117245 0.7296 AML other m 2021-07-21T14:56:12.61
IV.CSP1.EHE. ML:1.3 0.000047817504999999994 0.96 AML other m 2021-07-21T14:56:18.94
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