Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 27-07-2021 and time 06:39:17 (Italy) in region 4 km SE Montereale (AQ)

A magnitude ML 1.4 earthquake occured in region: 4 km SE Montereale (AQ), on

  • 27-07-2021 04:39:17 (UTC)
  • 27-07-2021 06:39:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.4950, 13.2600 at 14 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
Montereale AQ 4 2581 2581
Capitignano AQ 5 665 3246
Cagnano Amiterno AQ 5 1369 4615
Barete AQ 5 737 5352
Pizzoli AQ 7 4326 9678
Borbona RI 11 617 10295
Campotosto AQ 12 542 10837
Scoppito AQ 14 3727 14564
Posta RI 14 694 15258
Amatrice RI 15 2657 17915
Cittareale RI 16 482 18397
Antrodoco RI 17 2588 20985
Micigliano RI 17 127 21112
Crognaleto TE 19 1297 22409
Borgo Velino RI 19 972 23381
L'Aquila AQ 20 69753 93134

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km NW of L'Aquila (69753 inhabitants)
41 Km W of Teramo (54892 inhabitants)
51 Km E of Terni (111501 inhabitants)
69 Km SE of Foligno (57155 inhabitants)
70 Km NE of Tivoli (56533 inhabitants)
70 Km NE of Guidonia Montecelio (88673 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
76 Km W of Chieti (51815 inhabitants)
78 Km W of Pescara (121014 inhabitants)
93 Km NE of Roma (2864731 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
98 Km NE of Velletri (53303 inhabitants)
99 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 1.4 2021-07-27
04:39:17		 42.4948 13.2605 14 2021-12-29
11:12:32		 Bollettino Sismico Italiano INGV 95779231
Reviewed
Rev100 		ML 1.4 2021-07-27
04:39:17		 42.4903 13.2518 14 2021-07-27
04:45:13		 Sala Sismica INGV-Roma 93257581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-27 04:39:17 ± 0.07
Latitude 42.4948 ± 0.0036
Longitude 13.2605 ± 0.0037
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95779231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 380
Semi-minor axis of confidence ellipse (meter) 89
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 4
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) 88
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.57287
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 95779231
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-23 09:54:29

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 93257581
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-27 04:45:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
TV.SF04.EHZ. 2021-07-27T04:39:42.58 3.0 positive manual P 0.03 0
IV.NRCA.HHZ. 2021-07-27T04:39:30.31 0.6 undecidable manual S 342 39.4272 97 -0.23 47
IV.CESI.HHE. 2021-07-27T04:39:29.03 1.0 undecidable manual P 333 63.5919 93 0.28 22
IV.GAVE.EHN. 2021-07-27T04:39:29.74 0.6 undecidable manual S 306 37.0296 97 -0.18 47
IV.FDMO.HHZ. 2021-07-27T04:39:28.42 0.6 undecidable manual P 347 61.6938 94 -0.04 46
IV.MTRA.EHE. 2021-07-27T04:39:28.10 0.3 undecidable manual S 21 31.1466 100 -0.24 70
IV.TERO.HHN. 2021-07-27T04:39:28.19 0.6 undecidable manual S 63 31.4463 99 -0.24 47
IV.GIGS.HJZ. 2021-07-27T04:39:26.79 0.6 undecidable manual S 100 25.9518 103 -0.21 47
IV.MC2.EHZ. 2021-07-27T04:39:26.17 0.3 undecidable manual P 353 46.62 95 0.04 71
IV.LNSS.HHZ. 2021-07-27T04:39:25.73 0.3 undecidable manual S 304 21.6672 108 -0.15 73
IV.NRCA.HHZ. 2021-07-27T04:39:25.00 0.1 undecidable manual P 342 39.4272 97 -0.04 97
IV.GAVE.EHN. 2021-07-27T04:39:24.59 0.6 undecidable manual P 306 37.0296 97 -0.09 48
IV.SMA1.EHZ. 2021-07-27T04:39:24.79 0.3 undecidable manual S 22 16.2726 117 0.24 73
IV.T1299.EHN. 2021-07-27T04:39:24.35 0.3 undecidable manual S 7 15.5733 119 -0.04 75
IV.GIGS.HJZ. 2021-07-27T04:39:23.25 0.6 undecidable manual P 100 25.9518 103 0.26 48
IV.CAMP.HHE. 2021-07-27T04:39:23.86 0.6 undecidable manual S 69 12.9759 126 0.06 51
IV.FIAM.HNE. 2021-07-27T04:39:23.41 0.6 undecidable manual P 205 27.75 101 0.15 49
IV.MTRA.EHE. 2021-07-27T04:39:23.66 0.6 undecidable manual P 21 31.1466 100 -0.11 48
IV.TERO.HHN. 2021-07-27T04:39:23.95 0.6 undecidable manual P 63 31.4463 99 0.13 48
IV.RM33.EHZ. 2021-07-27T04:39:22.19 0.3 undecidable manual S 293 4.0959 160 -0.17 74
IV.LNSS.HHZ. 2021-07-27T04:39:22.42 0.3 undecidable manual P 304 21.6672 108 0.08 74
IV.CAMP.HHE. 2021-07-27T04:39:21.14 0.6 undecidable manual P 69 12.9759 126 -0.01 50
IV.SMA1.EHZ. 2021-07-27T04:39:21.83 0.3 undecidable manual P 22 16.2726 117 0.25 72
IV.T1299.EHN. 2021-07-27T04:39:21.64 0.3 undecidable manual P 7 15.5733 119 0.16 74
MN.AQU.HHE. 2021-07-27T04:39:21.87 0.6 undecidable manual P 143 19.5693 111 -0.18 48
IV.RM33.EHZ. 2021-07-27T04:39:20.52 0.1 undecidable manual P 293 4.0959 160 0.2 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.HNN. ML:1.5 0.00034977874999999996 0.9504 AML other m 2021-07-27T04:39:22.30
IV.RM33.EHN. ML:1.4 0.00032187460000000003 0.1984 AML other m 2021-07-27T04:39:22.30
IV.RM33.HNE. ML:1.3 0.00023756611 0.128 AML other m 2021-07-27T04:39:22.74
IV.RM33.EHE. ML:1.3 0.0002512856 0.1408 AML other m 2021-07-27T04:39:22.75
IV.NRCA.HHN. ML:1.6 0.0001472003 1.8784 AML other m 2021-07-27T04:39:31.98
IV.NRCA.HHE. ML:1.5 0.000107143365 0.1984 AML other m 2021-07-27T04:39:31.27
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