Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 23-03-2020 and time 08:54:39 (Italy) in region 6 km W Posta (RI)

A magnitude ML 1.6 earthquake occured in region: 6 km W Posta (RI), on

  • 23-03-2020 07:54:39 (UTC)
  • 23-03-2020 08:54:39 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.5070, 13.0280 at 8 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
Posta RI 6 694 694
Micigliano RI 7 127 821
Leonessa RI 8 2435 3256
Borbona RI 9 617 3873
Antrodoco RI 11 2588 6461
Cantalice RI 11 2755 9216
Borgo Velino RI 11 972 10188
Poggio Bustone RI 12 2055 12243
Castel Sant'Angelo RI 12 1308 13551
Rivodutri RI 14 1253 14804
Cittaducale RI 15 6828 21632
Morro Reatino RI 16 373 22005
Cittareale RI 17 482 22487
Cagnano Amiterno AQ 17 1369 23856
Monteleone di Spoleto PG 17 599 24455
Polino TR 17 233 24688
Rieti RI 18 47698 72386
Montereale AQ 18 2581 74967
Labro RI 19 374 75341

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km E of Terni (111501 inhabitants)
35 Km NW of L'Aquila (69753 inhabitants)
57 Km SE of Foligno (57155 inhabitants)
58 Km W of Teramo (54892 inhabitants)
61 Km NE of Guidonia Montecelio (88673 inhabitants)
63 Km NE of Tivoli (56533 inhabitants)
76 Km E of Viterbo (67173 inhabitants)
82 Km NE of Roma (2864731 inhabitants)
85 Km SE of Perugia (166134 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
93 Km N of Velletri (53303 inhabitants)
95 Km W of Chieti (51815 inhabitants)
97 Km W of Pescara (121014 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 1.6 2020-03-23
07:54:39		 42.5068 13.0277 8 2020-07-18
21:08:30		 Bollettino Sismico Italiano INGV 77731471
Reviewed
Rev100 		ML 1.8 2020-03-23
07:54:39		 42.5053 13.0165 8 2020-03-23
08:03:27		 Sala Sismica INGV-Roma 77492151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-03-23 07:54:39 ± 0.12
Latitude 42.5068 ± 0.0063
Longitude 13.0277 ± 0.0122
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 77731471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 866
Semi-minor axis of confidence ellipse (meter) 685
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 93
Circular confidence region, given by single value of horizontal uncertainty (meter) 870.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.09623
Epicentral distance of station farthest from the epicenter (degree) 0.46765
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 77492151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-03-23 08:03:27

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 77731471
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-03-31 16:41:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESX.HHZ. 2020-03-23T07:54:53.00 0.6 undecidable manual S 288 37.7289 50 0.58 42
IV.SMA1.EHZ. 2020-03-23T07:54:50.04 0.3 undecidable manual S 61 28.6491 106 0.52 66
IV.FIAM.HHZ. 2020-03-23T07:54:49.64 0.3 undecidable manual S 164 27.4503 106 0.5 67
IV.SRES.HHZ. 2020-03-23T07:54:49.35 0.3 undecidable manual P 235 51.9036 50 0.33 66
IV.T1299.HNZ. 2020-03-23T07:54:48.79 0.6 undecidable manual S 56 25.1526 108 0.43 45
IV.MC2.EHZ. 2020-03-23T07:54:47.75 0.6 undecidable manual P 16 46.7199 50 -0.48 43
IV.NRCA.HHZ. 2020-03-23T07:54:46.38 0.6 undecidable manual P 11 36.9297 50 -0.33 45
IV.CESX.HHZ. 2020-03-23T07:54:46.55 0.6 undecidable manual P 288 37.7289 50 -0.29 46
IV.SMA1.EHZ. 2020-03-23T07:54:45.08 0.1 undecidable manual P 61 28.6491 106 -0.08 97
IV.FIAM.HHZ. 2020-03-23T07:54:44.39 0.1 undecidable manual P 164 27.4503 106 -0.55 87
IV.T1299.HNZ. 2020-03-23T07:54:44.45 0.3 undecidable manual P 56 25.1526 108 -0.04 74
IV.RM33.EHZ. 2020-03-23T07:54:44.97 0.3 undecidable manual S 89 15.2736 118 -0.22 72
IV.LNSS.HHZ. 2020-03-23T07:54:43.94 0.6 undecidable manual S 6 10.6782 127 0.1 50
IV.RM33.EHZ. 2020-03-23T07:54:42.62 0.1 negative manual P 89 15.2736 118 -0.04 100
IV.LNSS.HHZ. 2020-03-23T07:54:41.77 0.1 negative manual P 6 10.6782 127 -0.11 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHN. ML:1.8 0.0006126996 0.3584 AML other m 2020-03-23T07:54:47.23
IV.RM33.HNN. ML:1.8 0.0006267082000000001 0.384 AML other m 2020-03-23T07:54:47.24
IV.RM33.EHE. ML:1.7 0.00053202065 0.7808 AML other m 2020-03-23T07:54:50.45
IV.RM33.HNE. ML:1.7 0.00051093275 0.7616 AML other m 2020-03-23T07:54:50.45
IV.FIAM.HHN. ML:1.0 0.000061392635 0.48 AML other m 2020-03-23T07:54:53.10
IV.FIAM.HHE. ML:1.0 0.00006034619500000001 0.8192 AML other m 2020-03-23T07:54:56.24
IV.FIAM.HNE. ML:2.6 0.0021022775000000002 5.8944 AML other m 2020-03-23T07:54:54.34
IV.FIAM.HNN. ML:1.6 0.000200996 0.576 AML other m 2020-03-23T07:55:00.47
IV.SMA1.EHN. ML:1.7 0.0002485354 0.5824 AML other m 2020-03-23T07:54:54.52
IV.SMA1.EHE. ML:1.6 0.00021075795 0.4032 AML other m 2020-03-23T07:54:50.07
IV.CESX.HHE. ML:1.3 0.00008068879 0.2368 AML other m 2020-03-23T07:54:57.13
IV.CESX.HHN. ML:1.4 0.00008676790500000001 0.2368 AML other m 2020-03-23T07:54:55.07
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