Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 16-08-2021 and time 17:56:48 (Italy) in region 5 km E Cittareale (RI)

A magnitude ML 1.7 earthquake occured in region: 5 km E Cittareale (RI), on

  • 16-08-2021 15:56:48 (UTC)
  • 16-08-2021 17:56:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6350, 13.2150 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
Cittareale RI 5 482 482
Amatrice RI 6 2657 3139
Accumoli RI 7 667 3806
Montereale AQ 13 2581 6387
Capitignano AQ 15 665 7052
Borbona RI 15 617 7669
Campotosto AQ 15 542 8211
Posta RI 16 694 8905
Arquata del Tronto AP 17 1178 10083
Cascia PG 19 3217 13300
Cagnano Amiterno AQ 19 1369 14669

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km NW of L'Aquila (69753 inhabitants)
40 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
55 Km SE of Foligno (57155 inhabitants)
78 Km W of Montesilvano (53738 inhabitants)
81 Km NE of Guidonia Montecelio (88673 inhabitants)
82 Km NE of Tivoli (56533 inhabitants)
84 Km W of Pescara (121014 inhabitants)
84 Km W of Chieti (51815 inhabitants)
85 Km SE of Perugia (166134 inhabitants)
94 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 1.7 2021-08-16
15:56:48		 42.6348 13.2152 13 2021-12-29
11:12:22		 Bollettino Sismico Italiano INGV 94578351
Reviewed
Rev100 		ML 1.7 2021-08-16
15:56:48		 42.6408 13.2142 12 2021-08-16
16:03:51		 Sala Sismica INGV-Roma 94262661
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-16 15:56:48 ± 0.08
Latitude 42.6348 ± 0.0045
Longitude 13.2152 ± 0.0049
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 94578351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 378
Semi-minor axis of confidence ellipse (meter) 286
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 345
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 76
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.46315
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 94262661
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-16 16:03:51

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 94578351
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-17 20:48:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IT.PLTA.HNZ. 2021-08-16T15:57:17.06 3.0 positive manual P 3.03 0
IV.VIVA.HHZ. 2021-08-16T15:57:08.42 3.0 positive manual P 0.49 0
IV.GUMA.HNN. 2021-08-16T15:57:05.16 0.3 undecidable manual S 12 48.4182 93 0.96 52
IV.CSP1.EHZ. 2021-08-16T15:57:04.92 0.3 undecidable manual S 359 50.7159 93 0.12 68
IV.MF5.EHZ. 2021-08-16T15:57:03.89 0.3 undecidable manual S 27 43.9227 93 0.89 54
IV.FDMO.HHZ. 2021-08-16T15:57:03.50 0.3 undecidable manual S 347 45.7209 93 0.02 70
IV.GIGS.HHN. 2021-08-16T15:57:00.66 0.6 undecidable manual S 124 35.5422 94 -0.09 46
IV.TERO.HHZ. 2021-08-16T15:56:59.32 0.6 undecidable manual S 92 31.746 95 -0.44 43
IV.MC2.EHZ. 2021-08-16T15:56:59.44 0.3 undecidable manual S 356 30.747 95 -0.05 72
IV.MMO1.EHZ. 2021-08-16T15:56:59.25 0.6 undecidable manual S 17 30.747 95 -0.23 46
IV.GAVE.EHZ. 2021-08-16T15:56:58.27 0.1 undecidable manual S 284 26.9508 97 -0.21 94
IV.CESX.HHZ. 2021-08-16T15:56:58.11 0.1 undecidable manual P 267 51.4152 92 -0.04 92
IV.GUMA.HNN. 2021-08-16T15:56:58.19 0.3 undecidable manual P 12 48.4182 93 0.5 63
IV.FDMO.HHZ. 2021-08-16T15:56:57.18 0.1 undecidable manual P 347 45.7209 93 -0.1 92
IV.MF5.EHZ. 2021-08-16T15:56:57.31 0.1 undecidable manual P 27 43.9227 93 0.31 89
IV.CSP1.EHZ. 2021-08-16T15:56:57.97 0.1 undecidable manual P 359 50.7159 93 -0.07 92
IV.MTRA.EHZ. 2021-08-16T15:56:56.12 0.1 undecidable manual S 48 20.0688 102 -0.54 87
IV.CAMP.HHZ. 2021-08-16T15:56:56.35 0.3 undecidable manual S 125 19.2696 104 -0.11 71
IV.NRCA.HHZ. 2021-08-16T15:56:56.87 0.1 undecidable manual S 340 23.5542 99 -0.7 83
IV.RM33.EHZ. 2021-08-16T15:56:55.30 0.1 undecidable manual S 180 13.9749 116 0.17 97
IV.GIGS.HHN. 2021-08-16T15:56:55.64 0.1 undecidable manual P 124 35.5422 94 -0.06 93
IV.TERO.HHZ. 2021-08-16T15:56:55.09 0.1 undecidable manual P 92 31.746 95 -0.04 95
IV.LNSS.HHZ. 2021-08-16T15:56:55.36 0.1 undecidable manual S 256 14.6742 114 0.05 98
IV.MMO1.EHZ. 2021-08-16T15:56:54.88 0.1 undecidable manual P 17 30.747 95 -0.09 95
IV.GAVE.EHZ. 2021-08-16T15:56:54.27 0.1 undecidable manual P 284 26.9508 97 -0.12 95
IV.SMA1.EHZ. 2021-08-16T15:56:54.23 0.1 undecidable manual S 93 9.7791 131 0.03 100
IV.MC2.EHZ. 2021-08-16T15:56:54.88 0.1 undecidable manual P 356 30.747 95 -0.09 95
IV.CAMP.HHZ. 2021-08-16T15:56:53.45 0.1 undecidable manual P 125 19.2696 104 0.22 95
IV.NRCA.HHZ. 2021-08-16T15:56:53.63 0.1 undecidable manual P 340 23.5542 99 -0.24 94
IV.T1299.EHZ. 2021-08-16T15:56:53.22 0.1 undecidable manual S 91 5.4945 150 -0.25 96
IV.MTRA.EHZ. 2021-08-16T15:56:53.20 0.1 undecidable manual P 48 20.0688 102 -0.14 95
IV.SMA1.EHZ. 2021-08-16T15:56:52.16 0.1 undecidable manual P 93 9.7791 131 0.24 96
IV.LNSS.HHZ. 2021-08-16T15:56:52.68 0.1 positive manual P 256 14.6742 114 0.12 97
IV.RM33.EHZ. 2021-08-16T15:56:52.74 0.1 positive manual P 180 13.9749 116 0.28 94
IV.T1299.EHZ. 2021-08-16T15:56:51.66 0.1 undecidable manual P 91 5.4945 150 0.17 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:2.3 0.00215 0.36 AML other m 2021-08-16T15:56:54.86
IV.SMA1.EHN. ML:2.3 0.0022800000000000003 0.34 AML other m 2021-08-16T15:56:54.78
IV.LNSS.HNE. ML:1.6 0.00035839905 0.1536 AML other m 2021-08-16T15:56:55.55
IV.LNSS.HHE. ML:1.7 0.0004515 0.46 AML other m 2021-08-16T15:56:55.55
IV.RM33.HNN. ML:1.7 0.0005155000000000001 0.14 AML other m 2021-08-16T15:56:55.63
IV.RM33.EHN. ML:1.7 0.000502 0.14 AML other m 2021-08-16T15:56:55.56
IV.RM33.HNE. ML:1.6 0.00034899999999999997 1.86 AML other m 2021-08-16T15:56:56.94
IV.RM33.EHE. ML:1.6 0.0003565 1.86 AML other m 2021-08-16T15:56:56.94
IV.MTRA.HNN. ML:2.2 0.0011105 0.1 AML other m 2021-08-16T15:56:56.27
IV.MTRA.EHN. ML:2.2 0.0011385 0.1 AML other m 2021-08-16T15:56:56.28
IV.LNSS.HHN. ML:1.6 0.000376 0.12 AML other m 2021-08-16T15:56:56.38
IV.LNSS.HNN. ML:1.6 0.00035026174999999997 0.128 AML other m 2021-08-16T15:56:56.38
IV.MTRA.HNE. ML:2.0 0.0007869999999999999 0.42 AML other m 2021-08-16T15:56:56.82
IV.MTRA.EHE. ML:2.0 0.000777 0.4 AML other m 2021-08-16T15:56:56.82
IV.NRCA.HHE. ML:1.9 0.0004395 0.3 AML other m 2021-08-16T15:56:57.12
IV.NRCA.HHN. ML:1.8 0.00039200000000000004 0.12 AML other m 2021-08-16T15:56:57.66
IV.NRCA.HNE. ML:1.8 0.00037805745 0.0768 AML other m 2021-08-16T15:56:57.95
IV.GAVE.EHN. ML:1.7 0.00027249999999999996 0.54 AML other m 2021-08-16T15:56:58.86
IV.GAVE.EHE. ML:1.9 0.000433 0.14 AML other m 2021-08-16T15:56:58.84
IV.TERO.HNN. ML:1.6 0.0001698251 0.0768 AML other m 2021-08-16T15:57:00.28
IV.TERO.HHN. ML:1.7 0.000223 0.4 AML other m 2021-08-16T15:57:00.28
IV.TERO.HNE. ML:1.8 0.00025803238 0.128 AML other m 2021-08-16T15:57:00.47
IV.TERO.HHE. ML:1.8 0.000248 0.94 AML other m 2021-08-16T15:57:00.47
IV.MF5.EHE. ML:1.5 0.0000892891265 0.3328 AML other m 2021-08-16T15:57:04.56
IV.CSP1.EHN. ML:1.6 0.00009165412000000001 0.256 AML other m 2021-08-16T15:57:05.91
IV.FDMO.HHE. ML:1.1 0.000038400000000000005 1.24 AML other m 2021-08-16T15:57:06.05
IV.FDMO.HHN. ML:1.1 0.000036599999999999995 0.82 AML other m 2021-08-16T15:57:06.66
IV.CESX.HHN. ML:1.4 0.000059300000000000005 0.14 AML other m 2021-08-16T15:57:06.72
IV.CSP1.EHE. ML:1.6 0.000112 1.2 AML other m 2021-08-16T15:57:06.13
IV.CESX.HHE. ML:1.3 0.000044800000000000005 1.06 AML other m 2021-08-16T15:57:07.60
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