Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 18-08-2021 and time 07:11:32 (Italy) in region 5 km N Amatrice (RI)

A magnitude ML 1.1 earthquake occured in region: 5 km N Amatrice (RI), on

  • 18-08-2021 05:11:32 (UTC)
  • 18-08-2021 07:11:32 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6720, 13.3040 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
Accumoli RI 5 667 3324
Arquata del Tronto AP 11 1178 4502
Cittareale RI 13 482 4984
Campotosto AQ 14 542 5526
Acquasanta Terme AP 14 2916 8442
Capitignano AQ 17 665 9107
Montereale AQ 17 2581 11688
Valle Castellana TE 18 977 12665
Cortino TE 18 656 13321
Rocca Santa Maria TE 18 537 13858
Montegallo AP 19 523 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)
58 Km SE of Foligno (57155 inhabitants)
72 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 SE of Perugia (166134 inhabitants)
89 Km NE of Tivoli (56533 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 1.1 2021-08-18
05:11:32		 42.6715 13.3035 12 2021-12-29
11:12:25		 Bollettino Sismico Italiano INGV 94955761
Reviewed
Rev100 		ML 1.1 2021-08-18
05:11:32		 42.6718 13.3028 13 2021-08-18
05:18:59		 Sala Sismica INGV-Roma 94319621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-18 05:11:32 ± 0.05
Latitude 42.6715 ± 0.0027
Longitude 13.3035 ± 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 94955761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 308
Semi-minor axis of confidence ellipse (meter) 276
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 71
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
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 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.04047
Epicentral distance of station farthest from the epicenter (degree) 0.48294
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 94955761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-02 10:30:54

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 94319621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-18 05:18:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-08-18T05:11:47.79 0.3 undecidable manual S 350 47.3193 92 0.24 68
IV.FDMO.HHZ. 2021-08-18T05:11:46.69 0.3 undecidable manual S 337 44.1225 92 -0.01 71
IV.GAVE.EHZ. 2021-08-18T05:11:43.88 0.3 undecidable manual S 274 33.4443 93 0.03 72
IV.VCEL.EHZ. 2021-08-18T05:11:42.57 0.6 undecidable manual P 125 53.6019 92 0.44 43
IV.MC2.EHZ. 2021-08-18T05:11:42.74 0.3 undecidable manual S 341 28.2495 94 0.29 69
IV.TERO.HHZ. 2021-08-18T05:11:41.57 0.3 undecidable manual S 102 25.0527 95 -0.06 72
IV.MMO1.EHZ. 2021-08-18T05:11:41.63 0.3 undecidable manual S 4 25.3524 95 -0.06 72
IV.CSP1.EHZ. 2021-08-18T05:11:41.32 0.3 undecidable manual P 350 47.3193 92 0.15 69
IV.RM33.EHZ. 2021-08-18T05:11:40.00 0.3 undecidable manual S 202 19.4694 99 -0.12 73
IV.FDMO.HHZ. 2021-08-18T05:11:40.47 0.3 undecidable manual P 337 44.1225 92 -0.21 68
IV.NRCA.HHZ. 2021-08-18T05:11:40.93 0.3 undecidable manual S 319 23.6541 96 -0.32 69
IV.LNSS.HHZ. 2021-08-18T05:11:40.99 0.3 undecidable manual S 251 22.755 96 -0.02 74
IV.CAMP.HHZ. 2021-08-18T05:11:39.38 0.3 undecidable manual S 150 17.3715 103 -0.2 72
IV.MC2.EHZ. 2021-08-18T05:11:38.23 0.3 undecidable manual P 341 28.2495 94 0 73
IV.MTRA.EHZ. 2021-08-18T05:11:38.04 0.3 undecidable manual S 39 12.0768 119 -0.23 71
IV.GAVE.EHZ. 2021-08-18T05:11:38.77 0.6 undecidable manual P 274 33.4443 93 -0.26 46
IV.NRCA.HHZ. 2021-08-18T05:11:37.42 0.1 positive manual P 319 23.6541 96 -0.11 97
IV.LNSS.HHZ. 2021-08-18T05:11:37.43 0.3 undecidable manual P 251 22.755 96 0.04 73
IV.TERO.HHZ. 2021-08-18T05:11:37.71 0.3 undecidable manual P 102 25.0527 95 -0.04 73
IV.MMO1.EHZ. 2021-08-18T05:11:37.77 0.3 undecidable manual P 4 25.3524 95 -0.02 73
IV.CAMP.HHZ. 2021-08-18T05:11:36.63 0.3 undecidable manual P 150 17.3715 103 0.06 74
IV.SMA1.EHZ. 2021-08-18T05:11:36.86 0.1 undecidable manual S 150 5.1948 150 -0.09 100
IV.T1299.HNZ. 2021-08-18T05:11:36.80 0.3 undecidable manual S 203 4.4955 154 -0.06 76
IV.RM33.EHZ. 2021-08-18T05:11:36.91 0.3 undecidable manual P 202 19.4694 99 0.03 74
IV.MTRA.EHZ. 2021-08-18T05:11:35.87 0.1 undecidable manual P 39 12.0768 119 0.06 100
IV.SMA1.EHZ. 2021-08-18T05:11:35.27 0.1 undecidable manual P 150 5.1948 150 0.22 97
IV.T1299.HNZ. 2021-08-18T05:11:35.28 0.1 undecidable manual P 203 4.4955 154 0.28 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:0.8 0.00007095 0.58 AML other m 2021-08-18T05:11:38.31
IV.MTRA.EHN. ML:1.0 0.0000945 0.26 AML other m 2021-08-18T05:11:38.38
IV.LNSS.HHE. ML:1.1 0.0000766 0.36 AML other m 2021-08-18T05:11:41.06
IV.NRCA.HHN. ML:1.1 0.0000701 0.08 AML other m 2021-08-18T05:11:41.25
IV.NRCA.HHE. ML:1.2 0.0000969 0.16 AML other m 2021-08-18T05:11:41.34
IV.LNSS.HHN. ML:1.1 0.000078 0.86 AML other m 2021-08-18T05:11:41.77
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