Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 23-09-2021 and time 18:26:57 (UTC) in region 4 km NE Cittareale (RI)

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

  • 23-09-2021 18:26:57 (UTC)
  • 23-09-2021 20:26:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6380, 13.2050 at 17 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 4 482 482
Amatrice RI 7 2657 3139
Accumoli RI 7 667 3806
Montereale AQ 13 2581 6387
Borbona RI 15 617 7004
Capitignano AQ 15 665 7669
Posta RI 15 694 8363
Campotosto AQ 16 542 8905
Arquata del Tronto AP 17 1178 10083
Cascia PG 18 3217 13300
Norcia PG 20 4957 18257
Cagnano Amiterno AQ 20 1369 19626

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km NW of L'Aquila (69753 inhabitants)
41 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
54 Km SE of Foligno (57155 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
81 Km NE of Guidonia Montecelio (88673 inhabitants)
82 Km NE of Tivoli (56533 inhabitants)
85 Km SE of Perugia (166134 inhabitants)
85 Km W of Pescara (121014 inhabitants)
85 Km W of Chieti (51815 inhabitants)
93 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
Reviewed
Rev100 		ML 1.3 2021-09-23
18:26:57		 42.6377 13.2047 17 2021-09-23
18:32:49		 Sala Sismica INGV-Roma 95794131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-23 18:26:57 ± 0.09
Latitude 42.6377 ± 0.0036
Longitude 13.2047 ± 0.0049
Depth (km) 17 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95794131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 396
Semi-minor axis of confidence ellipse (meter) 189
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
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 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.05756
Epicentral distance of station farthest from the epicenter (degree) 0.45416
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 95794131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-23 18:32:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-09-23T18:27:13.81 0.6 undecidable manual S 0 50.4162 98 0.18 46
IV.FDMO.HHZ. 2021-09-23T18:27:12.26 0.6 undecidable manual S 348 45.3213 100 -0.02 47
IV.MF5.EHZ. 2021-09-23T18:27:12.73 0.6 undecidable manual S 28 44.0226 100 0.77 39
IV.MMO1.HNE. 2021-09-23T18:27:08.44 0.3 undecidable manual S 19 30.6471 106 -0.05 73
IV.TERO.HHZ. 2021-09-23T18:27:08.53 0.6 undecidable manual S 93 32.6451 105 -0.45 46
IV.MC2.EHZ. 2021-09-23T18:27:08.77 0.6 undecidable manual S 358 30.4473 107 0.37 46
IV.GAVE.EHZ. 2021-09-23T18:27:07.09 0.6 undecidable manual S 284 26.0517 111 -0.21 47
IV.CSP1.EHZ. 2021-09-23T18:27:06.81 0.6 negative manual P 0 50.4162 98 -0.05 47
IV.NRCA.HHZ. 2021-09-23T18:27:06.18 0.6 undecidable manual S 341 22.9548 114 -0.36 46
IV.MF5.EHZ. 2021-09-23T18:27:06.27 0.6 positive manual P 28 44.0226 100 0.38 44
IV.CAMP.HHN. 2021-09-23T18:27:05.81 0.6 undecidable manual S 124 20.1687 119 -0.06 50
IV.FDMO.HHZ. 2021-09-23T18:27:05.95 1.0 negative manual P 348 45.3213 100 -0.13 23
IV.MTRA.EHZ. 2021-09-23T18:27:05.49 0.6 undecidable manual S 50 20.4684 118 -0.46 46
IV.SMA1.EHZ. 2021-09-23T18:27:04.04 0.6 undecidable manual S 94 10.6782 141 0.13 49
IV.MC2.EHZ. 2021-09-23T18:27:04.01 1.0 undecidable manual P 358 30.4473 107 0.16 24
IV.RM33.EHZ. 2021-09-23T18:27:04.64 0.6 undecidable manual S 177 14.2746 131 0.06 50
IV.LNSS.HHZ. 2021-09-23T18:27:04.68 0.6 undecidable manual S 254 13.9749 132 0.17 49
IV.TERO.HHZ. 2021-09-23T18:27:03.98 0.6 negative manual P 93 32.6451 105 -0.2 48
IV.MMO1.HNE. 2021-09-23T18:27:03.77 0.1 undecidable manual P 19 30.6471 106 -0.12 97
IV.GAVE.EHZ. 2021-09-23T18:27:03.24 0.1 negative manual P 284 26.0517 111 0.03 99
IV.T1299.HNE. 2021-09-23T18:27:03.20 0.6 undecidable manual S 93 6.3936 155 -0.08 51
IV.MTRA.EHZ. 2021-09-23T18:27:02.30 0.1 undecidable manual P 50 20.4684 118 -0.13 98
IV.NRCA.HHZ. 2021-09-23T18:27:02.65 0.1 negative manual P 341 22.9548 114 -0.12 97
IV.CAMP.HHN. 2021-09-23T18:27:02.38 0.1 undecidable manual P 124 20.1687 119 0 99
IV.LNSS.HHZ. 2021-09-23T18:27:01.69 0.1 undecidable manual P 254 13.9749 132 0.09 100
IV.T1299.HNE. 2021-09-23T18:27:01.00 0.1 undecidable manual P 93 6.3936 155 0.11 100
IV.SMA1.EHZ. 2021-09-23T18:27:01.39 0.6 positive manual P 94 10.6782 141 0.14 49
IV.RM33.EHZ. 2021-09-23T18:27:01.75 0.6 undecidable manual P 177 14.2746 131 0.11 49
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.3 0.0001525 0.14 AML other m 2021-09-23T18:27:04.50
IV.RM33.EHN. ML:1.2 0.00011115 0.26 AML other m 2021-09-23T18:27:04.70
IV.LNSS.HHN. ML:1.6 0.00033850000000000004 0.36 AML other m 2021-09-23T18:27:04.75
IV.RM33.EHE. ML:1.1 0.0000945 1.06 AML other m 2021-09-23T18:27:04.25
IV.LNSS.HHE. ML:1.6 0.000299 0.82 AML other m 2021-09-23T18:27:04.81
IV.SMA1.EHN. ML:1.2 0.0001395 0.96 AML other m 2021-09-23T18:27:04.86
IV.MTRA.EHN. ML:1.2 0.0000875 0.88 AML other m 2021-09-23T18:27:05.27
IV.MTRA.EHE. ML:1.2 0.00009795000000000001 0.48 AML other m 2021-09-23T18:27:06.27
IV.NRCA.HHE. ML:1.7 0.0002735 0.44 AML other m 2021-09-23T18:27:06.67
IV.NRCA.HHN. ML:1.6 0.00020150000000000002 1.86 AML other m 2021-09-23T18:27:07.98
IV.GAVE.EHN. ML:1.2 0.00007565 0.2 AML other m 2021-09-23T18:27:07.70
IV.GAVE.EHE. ML:1.1 0.00006445000000000001 0.76 AML other m 2021-09-23T18:27:08.34
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