Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 01-08-2020 and time 12:48:27 (Italy) in region 2 km SW Massa Martana (PG)

A magnitude ML 1.2 earthquake occured in region: 2 km SW Massa Martana (PG), on

  • 01-08-2020 10:48:27 (UTC)
  • 01-08-2020 12:48:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7670, 12.5070 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
Massa Martana PG 2 3770 3770
Todi PG 8 16851 20621
Acquasparta TR 9 4778 25399
Giano dell'Umbria PG 10 3846 29245
Montecastrilli TR 13 5022 34267
Avigliano Umbro TR 14 2558 36825
Castel Ritaldi PG 15 3278 40103
Monte Castello di Vibio PG 15 1567 41670
Fratta Todina PG 15 1839 43509
Collazzone PG 15 3473 46982
Gualdo Cattaneo PG 16 6155 53137
San Gemini TR 17 5018 58155
Montefalco PG 19 5679 63834
Spoleto PG 19 38218 102052

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NW of Terni (111501 inhabitants)
27 Km SW of Foligno (57155 inhabitants)
39 Km S of Perugia (166134 inhabitants)
51 Km NE of Viterbo (67173 inhabitants)
87 Km NW of L'Aquila (69753 inhabitants)
87 Km N of Guidonia Montecelio (88673 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
93 Km SE of Arezzo (99543 inhabitants)
95 Km NE of Civitavecchia (52991 inhabitants)
97 Km N of Roma (2864731 inhabitants)
99 Km W of Teramo (54892 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 1.2 2020-08-01
10:48:27		 42.7673 12.5067 8 2020-11-19
12:37:03		 Bollettino Sismico Italiano INGV 83562771
Reviewed
Rev100 		ML 1.2 2020-08-01
10:48:27		 42.7977 12.5392 10 2020-08-01
11:07:16		 Sala Sismica INGV-Roma 81543251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-01 10:48:27 ± 0.09
Latitude 42.7673 ± 0.0045
Longitude 12.5067 ± 0.0110
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 83562771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 877
Semi-minor axis of confidence ellipse (meter) 507
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 80
Circular confidence region, given by single value of horizontal uncertainty (meter) 880.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 137
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.32376
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 83562771
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-06 20:20:48

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 81543251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-01 11:07:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MGAB.HHZ. 2020-08-01T10:48:40.51 0.6 undecidable manual S 297 35.9418 50 0.15 47
IV.ASSB.HHZ. 2020-08-01T10:48:39.37 0.6 undecidable manual S 22 32.9448 104 -0.09 48
IV.GAVE.EHZ. 2020-08-01T10:48:39.37 0.6 undecidable manual S 105 32.6451 104 0.01 49
IV.ASSB.HHZ. 2020-08-01T10:48:34.60 0.3 undecidable manual P 22 32.9448 104 0.12 71
IV.GAVE.EHZ. 2020-08-01T10:48:34.38 0.1 undecidable manual P 105 32.6451 104 -0.05 97
IV.CESX.HHZ. 2020-08-01T10:48:34.30 0.6 undecidable manual S 160 18.7701 114 -0.49 45
IV.MGAB.HHZ. 2020-08-01T10:48:34.74 0.1 undecidable manual P 297 35.9418 50 -0.26 92
IV.CESX.HHZ. 2020-08-01T10:48:32.15 0.1 undecidable manual P 160 18.7701 114 0.36 93
IV.MOMA.HHZ. 2020-08-01T10:48:31.16 0.6 undecidable manual S 52 6.5934 141 -0.17 49
IT.GNU.HGE. 2020-08-01T10:48:31.17 0.6 undecidable manual S 52 6.5934 141 -0.16 49
IV.MOMA.HHZ. 2020-08-01T10:48:29.90 0.1 negative manual P 52 6.5934 141 0.11 100
IT.GNU.HGE. 2020-08-01T10:48:29.89 0.1 undecidable manual P 52 6.5934 141 0.1 100
IV.FOSV.EHZ. 2020-08-01T10:48:28.85 3.0 positive manual P 0.04 0
IV.MAGO.CHZ. 2020-08-01T10:48:26.79 3.0 negative manual P -0.01 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FOSV.EHN. ML:1.0 0.00001915 0.2 AML other m 2020-08-01T10:48:29.71
IV.FOSV.EHE. ML:1.2 0.00002875 0.08 AML other m 2020-08-01T10:48:29.65
IV.MOMA.HHN. ML:1.4 0.0004435 0.34 AML other m 2020-08-01T10:48:31.51
IV.MOMA.HHE. ML:1.7 0.0008925000000000001 0.8 AML other m 2020-08-01T10:48:31.30
IV.CESX.HHE. ML:0.9 0.0000585 1.32 AML other m 2020-08-01T10:48:36.19
IV.CESX.HHN. ML:1.0 0.000079 1.36 AML other m 2020-08-01T10:48:37.19
IV.MGAB.HHE. ML:1.3 0.0000731 0.7 AML other m 2020-08-01T10:48:40.32
IV.MGAB.HHN. ML:1.2 0.0000619 1.54 AML other m 2020-08-01T10:48:40.99
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