Earthquake with magnitude of Md 3.0 on date 23-07-1987 and time 08:11:31 (UTC) in region 7 km SE Monteverdi Marittimo (PI)

A magnitude Md 3.0 earthquake occured in region: 7 km SE Monteverdi Marittimo (PI), on

  • 23-07-1987 08:11:31 (UTC)
  • 23-07-1987 10:11:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.12, 10.76 at 5 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Monteverdi Marittimo PI 7 758 758
Monterotondo Marittimo GR 8 1371 2129
Suvereto LI 8 3072 5201
Sassetta LI 10 514 5715
Castagneto Carducci LI 13 9010 14725
Massa Marittima GR 13 8375 23100
Campiglia Marittima LI 14 13218 36318
Castelnuovo di Val di Cecina PI 15 2231 38549
San Vincenzo LI 18 6911 45460

Municipalities with at least 50000 inhabitants

An earthquake occurred to
50 Km NW of Grosseto (82087 inhabitants)
51 Km W of Siena (53903 inhabitants)
60 Km SE of Livorno (159219 inhabitants)
72 Km SE of Pisa (89158 inhabitants)
78 Km SW of Scandicci (50609 inhabitants)
82 Km SW of Firenze (382808 inhabitants)
83 Km S of Lucca (89046 inhabitants)
88 Km SW of Prato (191150 inhabitants)
91 Km S of Pistoia (90315 inhabitants)
92 Km SE of Viareggio (62467 inhabitants)
98 Km W of Arezzo (99543 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
Rev 1000 Md 3.0
ML-VAX 2.7
1987-07-23
08:11:31
43.13 10.76 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 52679
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-07-23 08:11:31 ± 0.16
Latitude 43.13 ± 0.01
Longitude 10.76 ± 0.02
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 52679

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 1943.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 31
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00559
Epicentral distance of station farthest from the epicenter (degree) 0.0289
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

Md:3

Field Value
Value 3
Uncertainty
Num. used stations 12
Type of magnitude Md
Reference to an origin 52679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:50:52

ML:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations 7
Type of magnitude ML
Reference to an origin 52679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.LMR.Z. 1987-07-23T08:12:56.00 10.0 undecidable manual SN 275 0.0279 -0.75 0.3
--.FRF.Z. 1987-07-23T08:12:54.00 10.0 undecidable manual SN 279 0.0272 -0.82 0.3
--.LRG.Z. 1987-07-23T08:12:23.00 10.0 undecidable manual PN 277 0.0289 0.87 0.6
--.LMR.Z. 1987-07-23T08:12:20.50 10.0 undecidable manual PN 275 0.0279 -0.05 1.2
--.FRF.Z. 1987-07-23T08:12:20.50 10.0 undecidable manual PN 279 0.0272 1.07 0.4
--.CTI.Z. 1987-07-23T08:12:20.19 10.0 undecidable manual PN 11 0.0269 1.22 0.3
--.DOI.Z. 1987-07-23T08:12:18.18 10.0 undecidable manual PN 299 0.0259 0.62 0.9
--.ASS.Z. 1987-07-23T08:12:16.70 10.0 undecidable manual SN 91 0.0124 0.94 0.3
--.SDI.Z. 1987-07-23T08:12:15.50 10.0 undecidable manual PN 120 0.0239 0.65 0.9
--.MDI.Z. 1987-07-23T08:12:14.90 10.0 undecidable manual PN 344 0.0248 -0.85 0.7
--.SAL.Z. 1987-07-23T08:12:13.36 10.0 undecidable manual PN 356 0.0223 1.28 0.3
--.SBF.Z. 1987-07-23T08:12:11.60 10.0 undecidable manual PN 287 0.0227 -0.97 0.6
--.ROB.Z. 1987-07-23T08:12:10.30 10.0 undecidable manual PN 300 0.0215 -0.53 1.1
--.IMI.Z. 1987-07-23T08:12:08.20 10.0 undecidable manual PN 291 0.02 -0.25 1.4
--.FIN.Z. 1987-07-23T08:12:07.20 10.0 undecidable manual PN 301 0.0193 -0.12 1.5
--.CRE.Z. 1987-07-23T08:12:07.00 10.0 undecidable manual SG 59 0.0089 1.11 0.2
--.CO9.Z. 1987-07-23T08:12:05.35 10.0 undecidable manual PN 330 0.017 1.41 0.2
--.VEA.Z. 1987-07-23T08:12:05.00 10.0 undecidable manual PN 335 0.0175 0.35 1.4
--.GEN.Z. 1987-07-23T08:12:03.50 10.0 undecidable manual PN 314 0.0166 0.23 1.5
--.ARV.Z. 1987-07-23T08:12:00.53 10.0 undecidable manual PN 75 0.0147 0.23 1.5
--.MAO.Z. 1987-07-23T08:11:58.23 10.0 undecidable manual SG 157 0.0068 -0.23 0.6
--.CVF.Z. 1987-07-23T08:11:57.90 10.0 undecidable manual PN 248 0.0134 -0.56 1.2
--.ASS.Z. 1987-07-23T08:11:56.65 10.0 undecidable manual PN 91 0.0124 -0.23 1.5
--.PS9.Z. 1987-07-23T08:11:53.38 10.0 undecidable manual SG 343 0.0056 -0.52 0.5
--.MME.Z. 1987-07-23T08:11:52.40 10.0 undecidable manual PG 357 0.0096 -0.17 1.6
--.SS9.Z. 1987-07-23T08:11:51.85 10.0 undecidable manual PN 44 0.01 -1.47 0.2
--.PGD.Z. 1987-07-23T08:11:51.16 10.0 positive manual PG 42 0.0091 -0.54 2.4
--.CRE.Z. 1987-07-23T08:11:50.78 10.0 undecidable manual PG 59 0.0089 -0.41 1.4
--.BDI.Z. 1987-07-23T08:11:49.82 10.0 undecidable manual PG 352 0.0085 -0.44 1.3
--.MAO.Z. 1987-07-23T08:11:46.57 10.0 undecidable manual PG 157 0.0068 -0.32 1.5
--.PS9.Z. 1987-07-23T08:11:44.12 10.0 positive manual PG 343 0.0056 -0.14 3.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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